Football Soccer - Schalke 04 v Ajax Amsterdam - UEFA Europa League Quarter Final Second Leg - Veltins-Arena, Gelsenkirchen, Germany - 20/4/17 Ajax's Amin Younes in action with Schalke's Sascha Riether Reuters / Wolfgang Rattay Livepic 

Football Soccer - Red Bull Salzburg v FC Schalke 04 - UEFA Europa League group stage - Group I - Red Bull Arena, Salzburg, Austria - 8/12/2016. FC Schalke 04's Sascha Riether and Red Bull Salzburg's Takumi Minamino in action. REUTERS/Dominic Ebenbichler 

Football Soccer - Red Bull Salzburg v FC Schalke 04 - UEFA Europa League group stage - Group I - Red Bull Arena, Salzburg, Austria - 8/12/2016. FC Schalke 04's Sascha Riether and Red Bull Salzburg's Takumi Minamino in action. REUTERS/Dominic Ebenbichler 

Football Soccer - FC Schalke 04 v OGC Nice - Europa League Group Stage - Veltins Arena, Gelsenkirchen, Germany - 24/11/16 - Schalke's Sascha Riether in action with Nice's Younes Belhanda. REUTERS/Wolfgang Rattay 

Football Soccer - FC Schalke 04 v OGC Nice - Europa League Group Stage - Veltins Arena, Gelsenkirchen, Germany - 24/11/16 - Schalke's Sascha Riether in action with Nice's Younes Belhanda. REUTERS/Wolfgang Rattay 

Fooball Soccer - Schalke 04 - German Bundesliga - Veltins Arena - Gelsenkirchen, Germany - 20/07/16. Shalke 04's players and staff during a team photo. Top row, L-R are: Thomas Kuhn (Leader Physiotherapist), Holger Remmers (Physiotherapist), Tim Hielscher (Physiotherapist), Sead Kolasinac, Klaas-Jan Huntelaar, Eric Maxim Choupo-Moting, Leon Goretzka, Naldo, Thomas Morus Scholl (Masseur), Markus Zetlmeisl (Fitness Coach), Tobias Hellwig (Analyst). Second row, L-R are: Jan-Pieter Martens (Teammanager), Lars Laser (Kitman), Andreas Falarzik (Team Doctor), Breel Embolo, Alessandro Schopf, Franco Di Santo, Thilo Kehrer, Matija Nastasic, Holger Blumenstein (Kitman), Enrico Heil (Kitman). Third row, L-R are: Ruwen Faller (Athletics Coach), Thomas Barth (Athletics Coach), Simon Henzler (Athletics Coach), Joshua Bitter, Johannes Geis, Dennis Aogo, Bernard Tekpetey, Kaan Ayhan, Tobias Zellner (Assistant), Wolfgang Beller (Assistant), Markus Weinzierl (Coach). Bottom row, L-R are: Donis Avdijaj, Max Meyer, Junior Caicara, Alexander Nubel, Fabian Giefer, Ralf F?hrmann, Timon Wellenreuther, Atsuto Uchida, Sascha Riether, Sidney Sam. REUTERS/Wolfgang Rattay 

Fooball Soccer - Schalke 04 - German Bundesliga - Veltins Arena - Gelsenkirchen, Germany - 20/07/16. Shalke 04's players and staff during a team photo. Top row, L-R are: Thomas Kuhn (Leader Physiotherapist), Holger Remmers (Physiotherapist), Tim Hielscher (Physiotherapist), Sead Kolasinac, Klaas-Jan Huntelaar, Eric Maxim Choupo-Moting, Leon Goretzka, Naldo, Thomas Morus Scholl (Masseur), Markus Zetlmeisl (Fitness Coach), Tobias Hellwig (Analyst). Second row, L-R are: Jan-Pieter Martens (Teammanager), Lars Laser (Kitman), Andreas Falarzik (Team Doctor), Breel Embolo, Alessandro Schopf, Franco Di Santo, Thilo Kehrer, Matija Nastasic, Holger Blumenstein (Kitman), Enrico Heil (Kitman). Third row, L-R are: Ruwen Faller (Athletics Coach), Thomas Barth (Athletics Coach), Simon Henzler (Athletics Coach), Joshua Bitter, Johannes Geis, Dennis Aogo, Bernard Tekpetey, Kaan Ayhan, Tobias Zellner (Assistant), Wolfgang Beller (Assistant), Markus Weinzierl (Coach). Bottom row, L-R are: Donis Avdijaj, Max Meyer, Junior Caicara, Alexander Nubel, Fabian Giefer, Ralf F?hrmann, Timon Wellenreuther, Atsuto Uchida, Sascha Riether, Sidney Sam. REUTERS/Wolfgang Rattay 

Fooball Soccer - Schalke 04 - German Bundesliga - Veltins Arena - Gelsenkirchen, Germany - 20/07/16. Shalke 04's players and staff during a team photo. Top row, L-R are: Thomas Kuhn (Leader Physiotherapist), Holger Remmers (Physiotherapist), Tim Hielscher (Physiotherapist), Sead Kolasinac, Klaas-Jan Huntelaar, Eric Maxim Choupo-Moting, Leon Goretzka, Naldo, Thomas Morus Scholl (Masseur), Markus Zetlmeisl (Fitness Coach), Tobias Hellwig (Analyst). Second row, L-R are: Jan-Pieter Martens (Teammanager), Lars Laser (Kitman), Andreas Falarzik (Team Doctor), Breel Embolo, Alessandro Schopf, Franco Di Santo, Thilo Kehrer, Matija Nastasic, Holger Blumenstein (Kitman), Enrico Heil (Kitman). Third row, L-R are: Ruwen Faller (Athletics Coach), Thomas Barth (Athletics Coach), Simon Henzler (Athletics Coach), Joshua Bitter, Johannes Geis, Dennis Aogo, Bernard Tekpetey, Kaan Ayhan, Tobias Zellner (Assistant), Wolfgang Beller (Assistant), Markus Weinzierl (Coach). Bottom row, L-R are: Donis Avdijaj, Max Meyer, Junior Caicara, Alexander Nubel, Fabian Giefer, Ralf F?hrmann, Timon Wellenreuther, Atsuto Uchida, Sascha Riether, Sidney Sam. REUTERS/Wolfgang Rattay 

Fooball Soccer - Schalke 04 - German Bundesliga - Veltins Arena - Gelsenkirchen, Germany - 20/07/16. Shalke 04's player Sascha Riether. REUTERS/Wolfgang Rattay 

Fooball Soccer - Schalke 04 - German Bundesliga - Veltins Arena - Gelsenkirchen, Germany - 20/07/16. Shalke 04's player Sascha Riether. REUTERS/Wolfgang Rattay 

Schalke 04's Sascha Riether is challenged by Sparta Prague's Petr Jiracek (L) and Lukas Marecek (R) during their Europa League group K soccer match in Gelsenkirchen, Germany, October 22, 2015. REUTERS/Wolfgang Rattay 

Schalke 04's Sascha Riether is challenged by Sparta Prague's Petr Jiracek (L) and Lukas Marecek (R) during their Europa League group K soccer match in Gelsenkirchen, Germany, October 22, 2015. REUTERS/Wolfgang Rattay 

Fulham's Sascha Riether (L) challenges Norwich City's Nathan Redmond during their English FA Cup soccer match at Craven Cottage in London January 14, 2014. REUTERS/Toby Melville (BRITAIN - Tags: SPORT SOCCER) 

Schalke 04's Lewis Holby is challenged by Cologne's Sascha Riether (R) during their German first division Bundesliga soccer match in Gelsenkirchen, August 13, 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 

Wolfsburg's Sascha Riether tackles Rubin Kazan's Alan Kazaev (front) during their Europa League last 16 second leg soccer match in Wolfsburg March 18, 2010. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT SOCCER) 

Villarreal's Nilmar (front) falls past Wolfsburg's Sascha Riether during their Europa League soccer match at the Madrigal Stadium in Villarreal February 18, 2010. REUTERS/Heino Kalis (SPAIN - Tags: SPORT SOCCER) 

CSKA Moscow's Alan Dzagoev (C) challenges VfL Wolfsburg's Josue (L) and Sascha Riether during their Champions League soccer match in Moscow, November 25, 2009. REUTERS/Grigory Dukor (RUSSIA SPORT SOCCER) 

CSKA Moscow's Sergei Ignashevich (R) challenges VfL Wolfsburg's Sascha Riether during their Champions League soccer match in Moscow November 25, 2009. REUTERS/Grigory Dukor (RUSSIA SPORT SOCCER) 

CSKA Moscow's Pavel Mamaev (L) challenges VfL Wolfsburg's Sascha Riether during their Champions League soccer match in Moscow, November 25, 2009. REUTERS/Grigory Dukor (RUSSIA SPORT SOCCER) 

CSKA Moscow's Tomas Necid (R) challenges VfL Wolfsburg's Sascha Riether during their Champions League soccer match in Moscow, November 25, 2009. REUTERS/Grigory Dukor (RUSSIA SPORT SOCCER) 

Besiktas' Bobo (L) challenges VfL Wolfsburg's Sascha Riether during their Champions League soccer match in Istanbul November 3, 2009. REUTERS/Murad Sezer (TURKEY SPORT SOCCER) 

Besiktas' Bobo (C) challenges VfL Wolfsburg's Sascha Riether (R) during their Champions League soccer match in Istanbul, November 3, 2009. REUTERS/Murad Sezer (TURKEY SPORT SOCCER) 

Besiktas's Bobo (C) challenges VfL Wolfsburg's Sascha Riether (R) and Josue (L) during their Champions League soccer match in Istanbul November 3, 2009. REUTERS/Murad Sezer (TURKEY SPORT SOCCER) 

Besiktas' Bobo competes for the ball with VfL Wolfsburg's Sascha Riether (L) during their Champions League soccer match in Wolfsburg October 21, 2009. REUTERS/Christian Charisius (GERMANY SPORT SOCCER) 

VfL Wolfsburg's Sascha Riether challenges CSKA Moscow's Georgi Schennikov (L) during their Champions League soccer match in Wolfsburg September 15, 2009. REUTERS/Christian Charisius (GERMANY SPORT SOCCER) 

VfL Wolfsburg's Sascha Riether challenges for the ball with Armand Traore (R) of Portsmouth during their UEFA Cup soccer match in Wolfsburg December 4, 2008. REUTERS/Christian Charisius (GERMANY) 

Greuther Fuerth's Christian Weber (L) and SC Freiburg's Sascha Riether react after their German second division Bundesliga soccer match in Freiburg May 14, 2006. Freiburg won the match 1-0, but both teams failed to be promoted to the first division. REUTERS/Alex Grimm 

FRANKFURT'S HENING AND KREUZ CHALLENGE RIETHER OF FREIBURG IN GERMAN BUNDESLIGA SOCCER MATCH IN FRANKFURT. Eintracht Frankfurt's Markus Kreuz (L) and Chris Hening (C) jump for the ball with Sascha Riether of SC Freiburg during their German Bundesliga soccer match in Frankfurt, April 24, 2004. REUTERS/Kai Pfaffenbach REUTERS ADVISES THAT ACCORDING TO THE DFL THIS IMAGE CAN NOT BE PUBLISHED ONLINE OR ON A MOBILE PLATFORM FOR THE DURATION OF THIS GAME WITHOUT ITS AUTHORITY. PLEASE CONTACT THE DFL DIRECTLY FOR FURTHER INFORMATION 

LEVERKUSEN'S NOWOTNY CHALLENGES RIETHER OF SC FREIBURG DURING THEIR GERMAN FIRST DIVISION BUNDESLIGA MATCH IN FREIBURG. Bayer Leverkusen's Jens Nowotny (L), challenges Sascha Riether of SC Freiburg during their German first division Bundesliga match in Freiburg, February 1, 2004. REUTERS/Vincent Kessler 

Sascha Riether (L) of Freiburg challenges Christian Poulsen (R) of
Schalke 04, during during their team's German soccer cup second round
match in Freiburg October 29, 2003. REUTERS/Vincent Kessler

VK 

Sascha Riether (R) of SC Freiburg tackles Sebastian Kehl of Borussia Dortmund during their German Soccer Cup second round match in Freiburg, Germany, November 5, 2002. Freiburg defeated Dortmund 3-0. 

Sascha Riether (R) of SC Freiburg tackles Sebastian Kehl of Borussia Dortmund during their German Soccer Cup second round match in Freiburg November 5, 2002. Freiburg defeated Dortmund 3-0. 

Sascha Riether (R) of SC Freiburg tries to stop Heiko Herrlich of Borussia Dortmund during their German Soccer Cup second round match in Freiburg November 5, 2002. Freiburg defeated Dortmund 3-0. 

Sascha Riether (R) of SC Freiburg tackles Sebastian Kehl of Borussia
Dortmund during their German Soccer Cup second round match in Freiburg
November 5, 2002. Freiburg defeated Dortmund 3-0. REUTERS/Vincent
Kessler

VK/GB 

Sascha Riether (R) of SC Freiburg tries to stop Heiko Herrlich of
Borussia Dortmund during their German Soccer Cup second round match in
Freiburg November 5, 2002. Freiburg defeated Dortmund 3-0.
REUTERS/Vincent Kessler

VK/GB 

Sascha Riether (R) of SC Freiburg tackles Sebastian Kehl of Borussia
Dortmund during their German Soccer Cup second round match in Freiburg,
Germany, November 5, 2002. Freiburg defeated Dortmund 3-0.
REUTERS/Vincent Kessler

VK/GB