Bendtner is spending the rest of the season with the Black Cats and Wenger accepts the striker needs the desire to come back.
"In our job, you never say never," commented the experienced French tactician.
"You do always what is right for your club. If it is right for the club to get Nicklas Bendtner back, the club will do it. I like him as a player.
"It will not only depend on us, it will depend on him. But we are not there yet - there is a long way to go."