It's claimed Barca will cough up over £2 million to Arsenal if they win the Champions League.
"You have somebody who checks all our contracts! I have to [check] the contract, I cannot tell you that," said Wenger.
He added: "Thomas Vermaelen left for one single reason, in the end he did not get the number of games and he is a top-quality player. Then we could not predict he would be injured for such long time.
"I hope for him and for Barcelona next season he can play. He is back in full training and I am sure he will show next season that he can play."