Walcott looked like he could be on his way out of the Emirates last month after he failed to agree a new deal, with the winger having just a year left on his current one.
Wenger persuaded him to stay – but he has not started him since the opening game of the season at home to Sunderland.
Asked if Walcott would start the match in the south of France tonight, Wenger would only say: “He is in the squad. Will he start? I don’t know yet.”
Wenger also indicated Walcott could be frozen out if the contract was not sorted.
“I still hope to extend his contract,” he added. “So at the moment it doesn’t affect me.
“Of course, say in April, if it is not done, you can think now it will be difficult to do.”