"The scan showed a minor tear and after discussions with the surgeon and the player, it was decided to operate," Physio Jim Joyce told the clubs official website.
"Antti had keyhole surgery last night which was the earliest we could have got it done from our previous experience of this sort of operation, we would expect him back in training in around three weeks - all being well.
"That gives him an outside chance of making the Palace game but it depends how he recovers."