Ivory Coast's Arthur Boka attends a team training session, ahead of their 2018 World Cup qualifier match against Liberia, in Abidjan November 11, 2015. REUTERS/Luc Gnago 

Malaga's Arthur Boka (R) controls the ball next to Sevilla's Jose Antonio Reyes during their Spanish first division soccer match at La Rosaleda stadium in Malaga, southern Spain, May 23, 2015. REUTERS/Jon Nazca 

Sevilla's Vicente Iborra (R) fights for the ball against Malaga's Arthur Boka during their Spanish first division soccer match at La Rosaleda stadium in Malaga, southern Spain, May 23, 2015. REUTERS/Jon Nazca 

Real Madrid's Gareth Bale (L) jumps for the ball with Malaga's Arthur Boka during their Spanish First Division soccer match at La Rosaleda stadium in Malaga, southern Spain November 29, 2014. REUTERS/Jon Nazca (SPAIN - Tags: SPORT SOCCER) 

Real Madrid's Cristiano Ronaldo jumps for the ball with Malaga's Arthur Boka during their Spanish First Division soccer match at La Rosaleda stadium in Malaga, southern Spain November 29, 2014. REUTERS/Jon Nazca (SPAIN - Tags: SPORT SOCCER) 

Real Madrid's Daniel Carvajal (R) battles for the ball with Malaga's Arthur Boka during their Spanish First Division soccer match at La Rosaleda stadium in Malaga, southern Spain November 29, 2014. REUTERS/Jon Nazca (SPAIN - Tags: SPORT SOCCER) 

Ivory Coast's Arthur Boka kicks the ball during their 2014 World Cup Group C soccer match against Greece at the Castelao arena in Fortaleza June 24, 2014. REUTERS/Marcelo Del Pozo (BRAZIL - Tags: SOCCER SPORT WORLD CUP) TOPCUP 

Ivory Coast's Arthur Boka (L) jumps for the ball with Greece's Dimitris Salpingidis during their 2014 World Cup Group C soccer match at the Castelao arena in Fortaleza June 24, 2014. REUTERS/Eddie Keogh (BRAZIL - Tags: SOCCER SPORT WORLD CUP)

Ivory Coast's Arthur Boka (L) looks at Greece's Giorgios Samaras during their 2014 World Cup Group C soccer match at the Castelao arena in Fortaleza June 24, 2014. REUTERS/Marcelo Del Pozo (BRAZIL - Tags: SOCCER SPORT WORLD CUP)

Greece's Giorgios Samaras (R) fights for the ball with Ivory Coast's Arthur Boka during their 2014 World Cup Group C soccer match at the Castelao arena in Fortaleza June 24, 2014. REUTERS/Marcelo Del Pozo (BRAZIL - Tags: SOCCER SPORT WORLD CUP)

Ivory Coast's Arthur Boka fights for the ball with Greece's Giorgios Samaras during their 2014 World Cup Group C soccer match at the Castelao arena in Fortaleza June 24, 2014. REUTERS/Mike Blake (BRAZIL - Tags: SOCCER SPORT WORLD CUP)

Ivory Coast's Arthur Boka kicks the ball during their 2014 World Cup Group C soccer match against Greece at the Castelao arena in Fortaleza June 24, 2014. REUTERS/Marcelo Del Pozo (BRAZIL - Tags: SOCCER SPORT WORLD CUP)

Greece's Giorgios Samaras (R) fights for the ball with Ivory Coast's Arthur Boka during their 2014 World Cup Group C soccer match at the Castelao arena in Fortaleza June 24, 2014. REUTERS/Marcelo Del Pozo (BRAZIL - Tags: SOCCER SPORT WORLD CUP)

Greece's Dimitris Salpingidis (L) fights for the ball with Ivory Coast's Geoffroy Serey Die and Arthur Boka (R) during their 2014 World Cup Group C soccer match at the Castelao arena in Fortaleza June 24, 2014. REUTERS/Marcelo Del Pozo (BRAZIL - Tags: SOCCER SPORT WORLD CUP)

Greece's Dimitris Salpingidis (L) fights for the ball with Ivory Coast's Arthur Boka during their 2014 World Cup Group C soccer match at the Castelao arena in Fortaleza June 24, 2014. REUTERS/Marcelo Del Pozo (BRAZIL - Tags: SOCCER SPORT WORLD CUP)

Ivory Coast's Arthur Boka (L) fights for the ball with Greece's Dimitris Salpingidis during their 2014 World Cup Group C soccer match at the Castelao arena in Fortaleza June 24, 2014. REUTERS/Marcelo Del Pozo (BRAZIL - Tags: SOCCER SPORT WORLD CUP)

Ivory Coast's Boubacar Barry (L) and Arthur Boka react after Colombia's Juan Quintero (not pictured) scored during their 2014 World Cup Group C soccer match at the Brasilia national stadium in Brasilia June 19, 2014. REUTERS/David Gray (BRAZIL - Tags: SOCCER SPORT WORLD CUP)

Ivory Coast's Arthur Boka (L) fights for the ball with Colombia's Juan Cuadrado during their 2014 World Cup Group C soccer match at the Brasilia national stadium in Brasilia June 19, 2014. REUTERS/Paul Hanna (BRAZIL - Tags: SOCCER SPORT WORLD CUP) TOPCUP 

Colombia's Juan Cuadrado (L) fights for the ball with Ivory Coast's Arthur Boka during their 2014 World Cup Group C soccer match at the Brasilia national stadium in Brasilia June 19, 2014. REUTERS/David Gray (BRAZIL - Tags: SOCCER SPORT WORLD CUP) TOPCUP 

Ivory Coast's Cheick Tiote, Geoffroy Serey Die and Arthur Boka (L-R) react after Colombia's Juan Quintero (not pictured) scored during their 2014 World Cup Group C soccer match at the Brasilia national stadium in Brasilia June 19, 2014. REUTERS/David Gray (BRAZIL - Tags: SOCCER SPORT WORLD CUP)

Ivory Coast's Arthur Boka reacts after Colombia won their 2014 World Cup Group C soccer match at the Brasilia national stadium in Brasilia June 19, 2014. REUTERS/David Gray (BRAZIL - Tags: SOCCER SPORT WORLD CUP)

Colombia's Juan Cuadrado (L) fights for the ball with Ivory Coast's Arthur Boka during their 2014 World Cup Group C soccer match at the Brasilia national stadium in Brasilia June 19, 2014. REUTERS/David Gray (BRAZIL - Tags: SOCCER SPORT WORLD CUP)

Colombia's Juan Cuadrado (C) is challenged by Ivory Coast's Arthur Boka during their 2014 World Cup Group C soccer match at the Brasilia national stadium in Brasilia June 19, 2014. REUTERS/Paul Hanna (BRAZIL - Tags: SOCCER SPORT WORLD CUP)

Colombia's Juan Cuadrado (L) fights for the ball with Ivory Coast's Arthur Boka during their 2014 World Cup Group C soccer match against Colombia at the Brasilia national stadium in Brasilia June 19, 2014. REUTERS/David Gray (BRAZIL - Tags: SOCCER SPORT WORLD CUP)

Ivory Coast's Arthur Boka (L) fights for the ball with Colombia's Juan Cuadrado during their 2014 World Cup Group C soccer match at the Brasilia national stadium in Brasilia June 19, 2014. REUTERS/Paul Hanna (BRAZIL - Tags: SOCCER SPORT WORLD CUP)

Ivory Coast's Arthur Boka (L) fights for the ball with Colombia's Juan Cuadrado during their 2014 World Cup Group C soccer match at the Brasilia national stadium in Brasilia June 19, 2014. REUTERS/Paul Hanna (BRAZIL - Tags: SOCCER SPORT WORLD CUP)

Ivory Coast's Arthur Boka fights for the ball with Colombia's Juan Cuadrado wduring their 2014 World Cup Group C soccer match at the Brasilia national stadium in Brasilia June 19, 2014. REUTERS/Ueslei Marcelino (BRAZIL - Tags: SOCCER SPORT WORLD CUP)

Ivory Coast's Arthur Boka is carried off the field during the team's 2014 World Cup Group C soccer match against Japan at the Pernambuco arena in Recife June 14, 2014. REUTERS/Stefano Rellandini (BRAZIL - Tags: SOCCER SPORT WORLD CUP)

Japan's Yuto Nagatomo and Ivory Coast's Arthur Boka fight for the ball during their 2014 World Cup Group C soccer match at the Pernambuco arena in Recife, June 14, 2014. REUTERS/Brian Snyder (BRAZIL - Tags: SOCCER SPORT WORLD CUP)

Ivory Coast's Arthur Boka kicks the ball during their international friendly soccer match against El Salvador in Frisco, Texas, June 4, 2014. REUTERS/Mike Stone (UNITED STATES - Tags: SPORT SOCCER WORLD CUP) 

Ivory Coast's Arthur Boka kicks the ball during their international friendly soccer match against El Salvador in Frisco, Texas, June 4, 2014. REUTERS/Mike Stone (UNITED STATES - Tags: SPORT SOCCER WORLD CUP) 

Ivory Coast's Arthur Boka is pictured before their international friendly soccer match against El Salvador in Frisco, Texas, June 4, 2014. REUTERS/Mike Stone (UNITED STATES - Tags: HEADSHOT SPORT SOCCER WORLD CUP) 

Ivory Coast's Arthur Boka (L) fights for the ball with Gambia's Sanna Nyassi during their 2014 World Cup qualifying soccer match at the Houphouet-Boigny stadium in Abidjan March 23, 2013. REUTERS/Luc Gnago (IVORY COAST - Tags: SPORT SOCCER) 

VfB Stuttgart's Arthur Boka (R) challenges Lazio's Antonio Candreva during their Europa League soccer match in Stuttgart March 7, 2013. REUTERS/Lisi Niesner (GERMANY - Tags: SPORT SOCCER) 

KRC Genk's Bennard Kumordzi (R) fights for the ball with VfB Stuttgart's Arthur Boka during their Europa League soccer match in Genk February 21, 2013. REUTERS/Laurent Dubrule (BELGIUM - Tags: SPORT SOCCER) 

VfB Stuttgart's Arthur Boka reacts after scoring against KRC Genk during their Europa League soccer match in Genk February 21, 2013. REUTERS/Laurent Dubrule (BELGIUM - Tags: SPORT SOCCER) 

VfB Stuttgart's Arthur Boka celebrates with teammate Ibrahima Traore (L) after scoring against KRC Genk during their Europa League soccer match in Genk February 21, 2013. REUTERS/Laurent Dubrule (BELGIUM - Tags: SPORT SOCCER) 

VfB Stuttgart's Arthur Boka (L) tries to save the ball while KRC Genk's Glynor Plet (C) scores a goal during their Europa League soccer match in Stuttgart February 14, 2013. REUTERS/Michaela Rehle (GERMANY - Tags: SPORT SOCCER) 

VfB Stuttgart's Arthur Boka (R) fights for the ball with KRC Genk's Thomas Buffel during their Europa League soccer match in Stuttgart February 14, 2013. Match ended in a draw 1-1. REUTERS/Michaela Rehle (GERMANY - Tags: SPORT SOCCER) 

VfB Stuttgart's Arthur Boka (L) heads the ball with KRC Genk's Thomas Buffel during their Europa League soccer match in Stuttgart February 14, 2013. REUTERS/Michaela Rehle (GERMANY - Tags: SPORT SOCCER) 

VfB Stuttgart's Arthur Boka (R) fights for the ball with KRC Genk's Thomas Buffel during their Europa League soccer match in Stuttgart February 14, 2013. REUTERS/Michaela Rehle (GERMANY - Tags: SPORT SOCCER) 

Ivory Coast's Souleman Bamba (L) and Arthur Boka (R) tackles Nigeria's Brown Ideye during their African Nations Cup (AFCON 2013) quarter final soccer match in Rustenburg, February 3, 2013. REUTERS/Mike Hutchings (SOUTH AFRICA - Tags: SPORT SOCCER) 

VfB Stuttgart's Timo Gebhart (R) celebrates his goal against Getafe with teammate Arthur Boka during their Europa League Group H soccer match at Colisseum Alfonso Perez stadium in Getafe November 4, 2010. REUTERS/Susana Vera (SPAIN - Tags: SPORT SOCCER) 

Stuttgart's Ciprian Marica (R) celebrates his goal against Getafe with teammate Arthur Boka and Zdravko Kuzmanovic (C) during their Europa League Group H soccer match at Colisseum Alfonso Perez stadium in Getafe November 4, 2010. REUTERS/Susana Vera (SPAIN - Tags: SPORT SOCCER) 

Stuttgart's Ciprian Marica (R) celebrates his goal against Getafe with teammate Arthur Boka during their Europa League Group H soccer match at Colisseum Alfonso Perez stadium in Getafe November 4, 2010. REUTERS/Susana Vera (SPAIN - Tags: SPORT SOCCER) 

Getafe's Javier Arizmendi (L) fights for the ball with Stuttgart's Arthur Boka during their Europa League Group H soccer match at Colisseum Alfonso Perez stadium in Getafe November 4, 2010. REUTERS/Susana Vera (SPAIN - Tags: SPORT SOCCER) 

Rwanda's Gerome Sina (L) fights for the ball with Ivory Coast's Arthur Boka (R) during their African Nations Cup qualification soccer match at Felix Houphouet-Boigny stadium in Abidjan September 4, 2010. REUTERS/ Thierry Gouegnon (IVORY COAST - Tags: SPORT SOCCER) 

Ivory Coast's Yaya Toure (3rd L) celebrates his goal with his team mates during the 2010 World Cup Group G soccer match against North Korea at Mbombela stadium in Nelspruit June 25, 2010. Pictured are (L-R) Ivory Coast's Arthur Boka, Didier Drogba, Yaya Toure, Gervais Yao Kouassi, Ndri Romaric, Kolo Toure and Didier Zokora. REUTERS/Daniel Munoz (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Ivory Coast's players pose for a team photograph before the 2010 World Cup Group G soccer match against North Korea at Mbombela stadium in Nelspruit June 25, 2010. The players are; ( back row, from L to R) goalkeeper Boubacar Barry, Kolo Toure, Ndri Romaric, Yaya Toure, Abdelkader Keita, and Cheik Ismael Tiote; ( front row, from L to R) Gervais Yao Kouassi, Arthur Boka, Didier Drogba, Emmanuel Eboue, and Didier Zokora. REUTERS/Daniel Munoz (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Ivory Coast's Gervais Yao Kouassi (C) fights for the ball with North Korea's Pak Chol-jin, as Arthur Boka watches, during a 2010 World Cup Group G soccer match at Mbombela stadium in Nelspruit June 25, 2010. REUTERS/Rogan Ward (SOUTH AFRICA - Tags: SPORT SOCCER WORLD CUP) 

Arthur Boka of VfB Stuttgart (L) heads the ball as Antonio Semedo of FC Unirea Urziceni watches during their Champions League soccer match in Stuttgart December 9, 2009. REUTERS/Johannes Eisele (GERMANY SPORT SOCCER) 

VfB Stuttgart's Arthur Boka (R) challenges Rangers' Kenny Miller during their Champions League soccer match at Ibrox Stadium in Glasgow November 24, 2009. REUTERS/Russell Cheyne (BRITAIN SPORT SOCCER) 

VFB Stuttgart's Arthur Boka (R) challenges Rangers' Kris Boyd during their Champions League group G soccer match at Ibrox Stadium in Glasgow, Scotland November 24, 2009. REUTERS/Russell Cheyne (BRITAIN SPORT SOCCER) 

The team of the Ivory Coast poses for a group shot before their soccer friendly against Germany in Gelsenkirchen November 18, 2009. (Top L-R) Sekou Cisse, Yaya Toure, Kolo Toure, Soulemane Bamba, Guy Demel and Salomon Kalou. (Bottom L-R) goalkeeper Aristide Zogbo, Emmanuel Eboue, Arthur Boka, Cheik Tiote and Didier Zokora. REUTERS/Wolfgang Rattay (GERMANY SPORT SOCCER) 

VfB Stuttgart's Arthur Boka (R) and Matthieu Delpierre challenge Unirea Urziceni's Marius Ioan Bilasco (C) during their Champions League Group G soccer match at Ghencea stadium in Bucharest, September 29, 2009. REUTERS/Bogdan Cristel (ROMANIA SPORT SOCCER) 

Vfb Stuttgart's Arthur Boka (L) challenges Unirea Urziceni's Ricardo Vilana during their Champions League soccer match at Ghencea stadium in Bucharest, September 29, 2009. REUTERS/Bogdan Cristel (ROMANIA SPORT SOCCER) 

VfB Stuttgart's Arthur Boka (L) fights for the ball with Rangers' Steven Whittaker during their Champions League soccer match in Stuttgart September 16, 2009. REUTERS/Thomas Bohlen (GERMANY SPORT SOCCER) 

VfB Stuttgart's Roberto Hilbert (L) celebrates his goal with his teammates Sami Khedira (2nd L), Arthur Boka (2nd R) and Martin Lanig (R) during their UEFA Cup soccer match against Standard Liege in Stuttgart December 18, 2008. REUTERS/Alexandra Beier (GERMANY) 

VfB Stuttgart's Arthur Boka (L) heads for the ball with Standard Liege's Wilfried Dalmat during their UEFA Cup soccer match in Stuttgart, December 18, 2008. REUTERS/Alexandra Beier (GERMANY) 

Ivory Coast's national soccer team pose before their international friendly soccer match against Israel at Ramat Gan stadium near Tel Aviv. Photo taken November 19, 2008. From (top L-R) Chrisitan Manfredini, Guy Demel, Souleman Bamba, Igor Lolo, Salomon Kalou, Boubacar Barry, (below L-R) Arthur Boka, Didier Drogba, Didier Zokora, Emerse Fae, Jean Jacques Gosso. REUTERS/Ammar Awad (ISRAEL)