He said Arsenal's cause had not been helped by the way Fabregas and Nasri had appeared to bed in so well at their new clubs after looking like they both might become bit-part players.
"Frankly, I never believed that," Wenger said.
"I always said that Cesc is a bargain. With Nasri at least we got a reasonable price for a player with one year to go.
"With Cesc we were forced into a situation because for me he is one of the best midfielders in the world and we knew that we would sell him under what he's worth."