Arsenal boss Mikel Arteta knows they'll face a battle against Wolves.
Arteta is aware Wolves will defend deep and in numbers.
He said, "They're very prepared. They have a lot of quality over there. It's not a coincidence what they're doing.
"They perform really well against the top sides and that says a lot about the coaching staff, what Gary (O'Neil) is doing, the way they have prepared and how they control opponents - difficult opponents - especially when they play at home. We're going to have to try to break them down tomorrow.
"Giving players tools, ideas and understanding the game we want to play. Then, as I mentioned before, it's about the efficiency we show in the last part of the pitch which dictates the outcome of the game. The other night we were very efficient on that."