Ozil is a confirmed target for Fenerbahce.
When asked if Ozil leaving this month would be in the interests of both player and club, Gallas told PlayOJO: "Maybe...
"It's been a long time since he last played and I'm sure he's frustrated.
"When you don't play, physically you'll be in trouble when you come back. If he can leave, he should leave."
The Frenchman added: "I don't think the board want Ozil so right now they need to find a solution and let him go to another club."