Fabregas penned an eight-year deal in 2006 and with four years still left to run, Wenger has again reacted to reports of Barca's interest in the 22-year-old.
Wenger lured Fabregas away from Catalonia to north London in 2003, and the Frenchman insists he is not about to sell any players that he has nurtured for so long.
"Do you want to see the length of his contract?" said Wenger, when asked again about the prospect of his skipper moving back to Camp Nou.
"Players at the end of contracts can sign where they want but, with the players who are under contract, we decide on their future.
"We are not under any financial need, we are well managed and that gives you one luxury in that you can decide about the future of your players.
"This team is on the way up and we don't work for four or five years with young players, stand up for them and let them come through and then, when they are ready to perform, sell them. That would be irresponsible.
"Some people are specialists at making players unhappy. I cannot stop them talking in Spain. But all of the players who have left here wanted to return."