Cameroon striker Samuel Eto'o has suffered a knee injury which has caused him to miss two days of training, sparking fears over his availability for the Indomitable Lions for the rest of the World Cup.

Eto'o played the full 90 minutes of his country's Group A opener against Mexico on Friday, which saw the West Africans fall to a 1-0 defeat, but he has since been unable to train.

Speaking at a press conference, Cameroon coach Volker Finke revealed that the striker had been troubled by a knee complaint since the end of the Premier League season.

"He has a problem with the right knee that he already had at the end of the season with his club Chelsea," said Finke.

"He did not train yesterday nor today."

Cameroon face Croatia on Wednesday in Manaus before rounding off the group stage with a clash against hosts Brazil.