Arsenal boss Mikel Arteta is wary of Europa League opponents Bodo/Glimt.
The manager warned that the visitors will be "tough".
Arteta said: "We've done our homework. Obviously, we have made the players aware of the team that we are facing tomorrow, the history and what they've done in the last few years.
"We have Martin in the squad who knows them really well and he's done his homework in the dressing room to understand that tomorrow is going to be a tough game.
"There are a few really good players and it's a really good coach as well, and they have a clear identity with how they play.
"You can see straight away what they are trying to do and again I've been impressed with them."