West Ham United co-chairman David Sullivan accepts Alex Song's ambitions may lie beyond the Boleyn Ground.
Song is on-loan from Barcelona and been linked with an end of season switch to Liverpool.
"First of all, I think Alex has been terrific but we haven't seen the best of him yet," he told the London Evening Standard.
"He has admitted he needs more matches before he will be 100 per cent. I believe he could be the best player at the club.
"We have a season loan and there is no break clause. At the end of the season we will look at things.
"It might be he has higher aspirations than us but he may love it at West Ham. I know him and his wife love London.
"It's very premature to talk about what we will do - I think you must look at it later in the season.
"We'd love him to stay but maybe a club in Turkey will offer him a crazy salary tax-free.
"It's hard to compete with that financially if the player is willing to play in Turkey or Russia."
