The Colombian goalkeeper started in place of Petr Cech for the opening Champions League Group A encounter in Paris and was the star of the show for the Gunners.
Of his performance, Wenger told arsenal.com: "In the decisive moments when he could have [conceded] a penalty, when at one down in the first half he came out with a good header.
"You know, I have two world-class goalkeepers, I will repeat that.
"I know we have enough games to give them games. But if you cannot play… you cannot keep as well two world-class goalkeepers that don't get games.
"Look, we have the roles that the keepers know. And that's why it's important to have clear roles when the season starts and when that changes I inform them. But they know what the roles of the season are."
Regarding Ospina's Champions League role going forward, Wenger added: "I would not like to answer that question tonight, because we can always change our mind.
"He has the right to train, to stay in the Champions League games."