Switzerland's Eren Derdiyok (2ndL) and his team mates celebrate after he scored during their friendly soccer match against Germany in Basel May 26, 2012. REUTERS/Arnd Wiegmann (SWITZERLAND - Tags: SPORT SOCCER) 

Switzerland's Stephan Lichtsteiner (2nd R) celebrates with (L-R) Gelson Fernandes, Eren Derdiyok and Admir Mehmedi after scoring a goal against Germany during their international friendly soccer match at St Jakob Park stadium in Basel, May 26, 2012. REUTERS/Michael Buholzer (SWITZERLAND - Tags: SPORT SOCCER) 

Switzerland's Eren Derdiyok celebrates after scoring his third goal of the match against Germany during their international friendly soccer match at St Jakob Park stadium in Basel, May 26, 2012. REUTERS/Michael Buholzer (SWITZERLAND - Tags: SPORT SOCCER) 

Switzerland's Eren Derdiyok (top) and his team mates celebrate after he scored during their friendly soccer match against Germany in Basel May 26, 2012. REUTERS/Arnd Wiegmann (SWITZERLAND - Tags: SPORT SOCCER) 

Switzerland's Eren Derdiyok celebrates after he scored during their friendly soccer match against Germany in Basel May 26, 2012. REUTERS/Arnd Wiegmann (SWITZERLAND - Tags: SPORT SOCCER) 

Switzerland's Eren Derdiyok (R) celebrates next to Germany's goalkeeper Marc-Andre Ter Stegen (C) and Marcel Schmelzer after scoring his first goal of the match against Germany during their international friendly soccer match at St Jakob Park stadium in Basel, May 26, 2012. REUTERS/Michael Buholzer (SWITZERLAND - Tags: SPORT SOCCER) 

Switzerland's Eren Derdiyok (2nd L) scores a goal past Germany's goalkeeper Marc-Andre Ter Stegen (R) and Marcel Schmelzer during their international friendly soccer match at St Jakob Park stadium in Basel, May 26, 2012. REUTERS/Michael Buholzer (SWITZERLAND - Tags: SPORT SOCCER) 

Bayer Leverkusen's Eren Derdiyok reacts during his Champions League last 16 second leg soccer match against Barcelona at Nou Camp stadium in Barcelona March 7, 2012. REUTERS/Gustau Nacarino (SPAIN - Tags: SPORT SOCCER) 

Chelsea's Didier Drogba, Alex and Branislav Ivanovic (L-R) react as they watch a goal from Bayer Leverkusen's Eren Derdiyok of Switzerland (not pictured) in their Champions League Group E soccer match in Leverkusen November 23, 2011. REUTERS/Wolfgang Rattay (GERMANY - Tags: SPORT SOCCER) 

Bayer Leverkusen's Eren Derdiyok celebrates scoring a goal against Chelsea during their Champions League Group E soccer match in Leverkusen November 23, 2011. REUTERS/Wolfgang Rattay (GERMANY - Tags: SPORT SOCCER) 

Bayer Leverkusen's Eren Derdiyok celebrates scoring a goal against Chelsea during their Champions League Group E soccer match in Leverkusen November 23, 2011. REUTERS/Wolfgang Rattay (GERMANY - Tags: SPORT SOCCER) 

Bayer Leverkusen's Eren Derdiyok celebrates scoring a goal against Chelsea during their Champions League Group E soccer match in Leverkusen November 23, 2011. REUTERS/Wolfgang Rattay (GERMANY - Tags: SPORT SOCCER) 

Switzerland's Eren Derdiyok (C) celebrates with teammates after scoring his first goal against Montenegro during their Euro 2012 Group G qualifying soccer match in Basel October 11, 2011. REUTERS/Christian Hartmann (SWITZERLAND - Tags: SPORT SOCCER) 

Switzerland's Eren Derdiyok (L) fights for the ball with Montenegro's Radoslav Batak during their Euro 2012 Group G qualifying soccer match in Basel October 11, 2011. REUTERS/Michael Buholzer (SWITZERLAND - Tags: SPORT SOCCER) 

Switzerland's Eren Derdiyok attends a team training session at The Liberty Stadium in Swansea October 6, 2011. Switzerland are due to play Wales in a Euro 2012 qualifier in Swansea on October 7, 2011. REUTERS/ Eddie Keogh (BRITAIN - Tags: SPORT SOCCER) 

Bayer Leverkusen's Eren Derdiyok tries to score against Werder Bremen during the German first division Bundesliga soccer match in Leverkusen, August 14, 2011. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT SOCCER) DFL LIMITS USE OF IMAGES ON THE INTERNET TO 15 PICTURES DURING THE MATCH AND PROHIBITS MOBILE (MMS) USE DURING AND UP TO 2 HOURS POST MATCH. FOR MORE INFORMATION CONTACT DFL 

Switzerland's Eren Derdiyok challenges Thomas Beck (L) and Michele Polverino (R) of Liechtenstein during their international friendly soccer match in Vaduz August 10, 2011. REUTERS/Arnd Wiegmann (SWITZERLAND - Tags: SPORT SOCCER) 

Switzerland's (from R) Eren Derdiyok and his team mates Goekhan Inler and Xherdan Shaqiri celebrate after he scored during their international friendly soccer match against Liechtenstein in Vaduz August 10, 2011. REUTERS/Arnd Wiegmann (SWITZERLAND - Tags: SPORT SOCCER) 

Switzerland's Eren Derdiyok challenges Sandro Wieser (R) of Liechtenstein during their international friendly soccer match in Vaduz August 10, 2011. REUTERS/Arnd Wiegmann (SWITZERLAND - Tags: SPORT SOCCER) 

Switzerland's national soccer team players (1st row, L to R) Diego Benaglio, Philippe Senderos, Johan Djourou, Granit Xhaka, Reto Ziegler, Eren Derdiyok, (2nd row, L to R) Goekhan Inler, Valon Behrami, Tranquillo Barnetta, Stefan Lichtsteiner and Xherdan Shakiri pose prior their Euro 2012 Group G qualifying soccer match against England at Wembley Stadium in London June 4, 2011. REUTERS/Darren Staples (BRITAIN - Tags: SPORT SOCCER) 

Switzerland's Eren Derdiyok is carried on a stretcher after being injured during his team's Euro 2012 Group G qualifying soccer match against England at Wembley Stadium in London June 4, 2011. REUTERS/Darren Staples (BRITAIN - Tags: SPORT SOCCER)

Switzerland's Eren Derdiyok receives medical assistance after being injured during his team's Euro 2012 Group G qualifying soccer match against England at Wembley Stadium in London June 4, 2011. REUTERS/Darren Staples (BRITAIN - Tags: SPORT SOCCER)

Eren Derdiyok of Switzerland (R) is challenged by Kostadin Stoyanov of Bulgaria (L) during their Euro 2012 qualifying Group G soccer match in Sofia, March 26, 2011. REUTERS/Oleg Popov (BULGARIA - Tags: SPORT SOCCER)

Bayer Leverkusen's Eren Derdiyok (L) challenges Metalist Kharkiv's Fininho during their Europa League round of 32, first leg soccer match in Kharkiv February 17, 2011. REUTERS/Gleb Garanich (UKRAINE - Tags: SPORT SOCCER) 

Bayer Leverkusen's Eren Derdiyok challenges Aris Salonika's Juan Toja (L) during their Europa League Group B soccer match in Leverkusen November 4, 2010. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT SOCCER) 

Bayer Leverkusen's Eren Derdiyok celebrates after scoring a goal against Atletico Madrid during their Europa League Group B soccer match at Vicente Calderon stadium in Madrid September 30, 2010. REUTERS/Andrea Comas (SPAIN - Tags: SPORT SOCCER) 

Bayer Leverkusen's Eren Derdiyok celebrates after scoring a goal against Atletico Madrid during their Europa League Group B soccer match at Vicente Calderon stadium in Madrid September 30, 2010. REUTERS/Andrea Comas (SPAIN - Tags: SPORT SOCCER) 

Bayer Leverkusen's Eren Derdiyok (L) and Rosenborg Trondheim's Mattias Bjaersmyr jump during their Europa League Group B soccer match in Leverkusen September 16, 2010. REUTERS/Wolfgang Rattay (GERMANY - Tags: SPORT SOCCER) 

Switzerland's Eren Derdiyok (L) jumps for the ball with Australia's Lucas Neill (R) during their friendly soccer match in St.Gallen September 3, 2010. REUTERS/Romina Amato (SWITZERLAND - Tags: SPORT SOCCER) 

Switzerland's Eren Derdiyok (R) fights for the ball with Australia's Carl Valeri during their friendly soccer match in St. Gallen September 3, 2010. REUTERS/Miro Kuzmanovic (SWITZERLAND - Tags: SPORT SOCCER) 

Austria's Jakob Jantscher (L) and Emanuel Pogatetz (C) challenge Switzerland's Eren Derdiyok for the ball during their international friendly soccer match in Klagenfurt August 11, 2010. REUTERS/Dominic Ebenbichler (AUSTRIA - Tags: SPORT SOCCER) 

Switzerland's Eren Derdiyok reacts at the end of a 2010 World Cup Group H match against Honduras at Free State stadium in Bloemfontein June 25, 2010. REUTERS/Radu Sigheti (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Switzerland's Tranquillo Barnetta (L) and Eren Derdiyok react with dejection after the 2010 World Cup Group H match against Honduras at Free State stadium in Bloemfontein June 25, 2010. Switzerland and Honduras made their exits on Friday and will not advanced to the second round of the World Cup. REUTERS/Siphiwe Sibeko (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Switzerland's (from L) Hakan Yakin, Alexander Frei, Eren Derdiyok, and Xherdan Shaqiri react after the 2010 World Cup Group H match against Honduras at Free State stadium in Bloemfontein June 25, 2010. Switzerland and Honduras made their exits on Friday and will not advanced to the second round of the World Cup. REUTERS/Michael Buholzer (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Switzerland's Eren Derdiyok reacts to a missed chance during the 2010 World Cup Group H match against Honduras at Free State stadium in Bloemfontein June 25, 2010. REUTERS/Michael Buholzer (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Switzerland's Eren Derdiyok and Hakan Yakin (R) react during the 2010 World Cup Group H soccer match against Honduras at Free State stadium in Bloemfontein June 25, 2010. REUTERS/Jorge Silva (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Switzerland's Eren Derdiyok (C) and Benjamin Huggel (L) react after a missed chance by team mate Alexander Frei on the Honduras'goal during their 2010 World Cup Group H soccer match at Free State stadium in Bloemfontein June 25, 2010. REUTERS/Siphiwe Sibeko (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Honduras' Maynor Figueroa fights for the ball with Switzerland's Eren Derdiyok (front) during a 2010 World Cup Group H match at Free State stadium in Bloemfontein June 25, 2010. REUTERS/Radu Sigheti (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Switzerland's Eren Derdiyok fights for the ball with Honduras' Osman Chavez (R) during the 2010 World Cup Group H soccer match at Free State stadium in Bloemfontein June 25, 2010. REUTERS/Amr Abdallah Dalsh (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP IMAGE OF THE DAY TOP PICTURE) 

Switzerland's Eren Derdiyok recovers from a fall in front of Honduras' goalkeeper Noel Valladares during their 2010 World Cup Group H soccer match at Free State stadium in Bloemfontein June 25, 2010. REUTERS/Amr Abdallah Dalsh (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Switzerland players line-up for a team photo before the 2010 World Cup Group H match against Honduras at Free State stadium in Bloemfontein June 25, 2010. Back row (L-R) Goalkeeper Diego Benaglio, Eren Derdiyok, Benjamin Huggel,Blaise Nkufo, Stephane Grichting and Reto Ziegler. Front row (L-R) Gokhan Inler, Stephan Lichtsteiner, Tranquillo Barnetta, Steve Von Bergen and Gelson Fernandes. REUTERS/Michael Buholzer (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Honduras' Maynor Figueroa fights for the ball with Switzerland's Eren Derdiyok (R) during their 2010 World Cup Group H match at Free State stadium in Bloemfontein June 25, 2010. REUTERS/Amr Abdallah Dalsh (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Switzerland's Eren Derdiyok (R), Gokhan Inler (C), Marco Padalino (L) and Valon Behrami take part in a team training session in Bloemfontein, June 24, 2010. REUTERS/Jorge Silva (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Switzerland's national soccer team players (L to R) Eren Derdiyok, Ludovic Magnin, Alexander Frei, Tranquillo Barnetta and Hakan Yakin attends a training session at the Central University of Technology stadium in Bloemfontein June 24, 2010. REUTERS/Michael Buholzer (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Switzerland's Eren Derdiyok attends a training session at the Central University of Technology stadium in Bloemfontein June 24, 2010. REUTERS/Michael Buholzer (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Switzerland's national soccer team players Eren Derdiyok (L) and Tranquillo Barnetta attend a training session in Vanderbijlpark, outside Johannesburg June 22, 2010. REUTERS/Michael Buholzer (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Switzerland's national soccer team players Alexander Frei (L), Eren Derdiyok (C) and Xherdan Shaqiri run during a training session in Vanderbijlpark, outside Johannesburg June 22, 2010. REUTERS/Michael Buholzer (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Chile's Gary Medel and Switzerland's Eren Derdiyok (R) fight for the ball during the 2010 World Cup Group H match in Port Elizabeth June 21, 2010. REUTERS/Michael Buholzer (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Switzerland's national soccer team players Alexander Frei (L) and Eren Derdiyok attend a training session in Port Elizabeth June 20, 2010. REUTERS/Michael Buholzer (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Switzerland's national soccer team players Alexander Frei (R) looks on next to Eren Derdiyok during a training session in Port Elizabeth June 20, 2010. REUTERS/Denis Balibouse (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

(L-R) Switzerland's national soccer team players Hakan Yakin, Eren Derdiyok, Alexander Frei, Benjamin Huggel and Stephan Lichtsteiner warm up during a training session in Port Elizabeth June 20, 2010. REUTERS/Denis Balibouse (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Switzerland's national soccer team player Eren Derdiyok kicks a ball during a training session in Vanderbijlpark, outside Johannesburg June 19, 2010. REUTERS/Michael Buholzer (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Switzerland's national soccer team players Valon Behrami (L) and Eren Derdiyok run for a ball during a training session in Vanderbijlpark, outside Johannesburg June 19, 2010. REUTERS/Michael Buholzer (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Switzerland's Eren Derdiyok (R) falls after being tackled by Spain's goalkeeper Iker Casillas (L) moments before Switzerland's Gelson Fernandes (C, back) scores against Spain during a 2010 World Cup Group H match at Moses Mabhida stadium in Durban June 16, 2010. REUTERS/Yves Herman (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Switzerland's Eren Derdiyok (R) falls after being tackled by Spain's goalkeeper Iker Casillas (L) moments before Switzerland's Gelson Fernandes (C, back) scores against Spain during a 2010 World Cup Group H match at Moses Mabhida stadium in Durban June 16, 2010. REUTERS/Yves Herman (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Switzerland's Eren Derdiyok (R) is tackled by Spain's goalkeeper Iker Casillas (L, obscured) moments before Switzerland's Gelson Fernandes (C, back) scores against Spain during a 2010 World Cup Group H match at Moses Mabhida stadium in Durban June 16, 2010. REUTERS/Yves Herman (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Switzerland's Eren Derdiyok (R) is tackled by Spain's goalkeeper Iker Casillas (bottom) moments before Switzerland's Gelson Fernandes (C, back) scores against Spain during a 2010 World Cup Group H match at Moses Mabhida stadium in Durban June 16, 2010. REUTERS/Yves Herman (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Switzerland's Eren Derdiyok is tackled by Spain's goalkeeper Iker Casillas (bottom) moments before Switzerland's Gelson Fernandes (C, back) scores against Spain during a 2010 World Cup Group H match at Moses Mabhida stadium in Durban June 16, 2010. REUTERS/Yves Herman (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Switzerland's Eren Derdiyok (2nd R) is tackled by Spain's goalkeeper Iker Casillas (R) moments before Switzerland's Gelson Fernandes (C, back) scores against Spain during a 2010 World Cup Group H match at Moses Mabhida stadium in Durban June 16, 2010. REUTERS/Yves Herman (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Switzerland's Eren Derdiyok (R) is tackled by Spain's goalkeeper Iker Casillas (L) moments before Switzerland's Gelson Fernandes (3rd R) scores against Spain during a 2010 World Cup Group H match at Moses Mabhida stadium in Durban June 16, 2010. REUTERS/Yves Herman (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP)