Wenger believes Arsenal have enough to make the Europa League final but insists the Premier League is a fair reflection of their "real quality".
The Gunners will be looking to overturn a 2-1 first-leg deifict in their semi-final against Villarreal on Thursday night.
"I want them to do well," he told beIN SPORTS. "It's an opportunity to get to a final and come back to the Champions League.
"I believe there is no chance of that in the Premier League but it's still possible [through the Europa League].
"It will be a success if Arsenal win a trophy, that is always a success, but your real qualities are decided by where you stand in the championship.
"This is the route left for them and they have to completely for it. It's very strange [Arsenal facing former manager Emery], it looks like an indoor Arsenal game, especially with no fans! But overall you still have an advantage playing at home, you feel more comfortable at home. I would say Arsenal have enough offensive potential to win the game.
"You have so many strikers and people who can score goals and be creative. 2-1 is the result at the moment but you should be quite confident to change and reverse it."