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PORTO ALEGRE, BRAZIL - JUNE 25: John Obi Mikel of Nigeria looks on during the National Anthem prior to the 2014 FIFA World Cup Brazil Group F match between Nigeria and Argentina at Estadio Beira-Rio on June 25, 2014 in Porto Alegre, Brazil. (Photo by Paul Gilham/Getty Images)

PORTO ALEGRE, BRAZIL - JUNE 25:  John Obi Mikel of Nigeria looks on during the National Anthem prior to the 2014 FIFA World Cup Brazil Group F match between Nigeria and Argentina at Estadio Beira-Rio on June 25, 2014 in Porto Alegre, Brazil.  (Photo by Paul Gilham/Getty Images)

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John Obi Mikel (R) of Nigeria celebrates his goal scored against Denmark during the Rio 2016 Olympic Games mens quarter-final football match Nigeria vs Denmark, at the Arena Fonte Nova Stadium in Salvador, Brazil on August 13, 2016 / AFP / NELSON ALMEIDA (Photo credit should read NELSON ALMEIDA/AFP via Getty Images)

John Obi Mikel (R) of Nigeria celebrates his goal scored against Denmark during the Rio 2016 Olympic Games mens quarter-final football match Nigeria vs Denmark, at the Arena Fonte Nova Stadium in Salvador, Brazil on August 13, 2016 / AFP / NELSON ALMEIDA        (Photo credit should read NELSON ALMEIDA/AFP via Getty Images)

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CUIABA, BRAZIL - JUNE 21: John Obi Mikel of Nigeria controls the ball during the 2014 FIFA World Cup Group F match between Nigeria and Bosnia-Herzegovina at Arena Pantanal on June 21, 2014 in Cuiaba, Brazil. (Photo by Clive Brunskill/Getty Images)

CUIABA, BRAZIL - JUNE 21:  John Obi Mikel of Nigeria controls the ball during the 2014 FIFA World Cup Group F match between Nigeria and Bosnia-Herzegovina at Arena Pantanal on June 21, 2014 in Cuiaba, Brazil.  (Photo by Clive Brunskill/Getty Images)

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Nigerian national team midfielder John Obi Mikel moves the ball during a World Cup preparation friendly match against Greece in Chester, Pennsylvania, on June 3, 2014. The match ended in a goalless draw. AFP PHOTO/Nicholas KAMM (Photo credit should read NICHOLAS KAMM/AFP via Getty Images)

Nigerian national team midfielder John Obi Mikel moves the ball during a World Cup preparation friendly match against Greece in Chester, Pennsylvania, on June 3, 2014. The match ended in a goalless draw.   AFP PHOTO/Nicholas KAMM        (Photo credit should read NICHOLAS KAMM/AFP via Getty Images)

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BRASILIA, BRAZIL - JUNE 29: John Obi Mikel of Nigeria answers to the media during a press conference on the eve of the 2014 FIFA World Cup Brazil round of 16 match between France and Nigeria at Estadio Nacional on June 29, 2014 in Brasilia, Brazil. (Photo by Jean Catuffe/Getty Images)

BRASILIA, BRAZIL - JUNE 29: John Obi Mikel of Nigeria answers to the media during a press conference on the eve of the 2014 FIFA World Cup Brazil round of 16 match between France and Nigeria at Estadio Nacional on June 29, 2014 in Brasilia, Brazil. (Photo by Jean Catuffe/Getty Images)