Arsenal must overcome a 2-0 deficit tonight in Germany.
"When I analyse Arsenal and the first game (last month), we saw the quality of (Santi) Cazorla, we saw what happened until the (early) penalty (Mesut) Ozil missed, what happened in the first nine minutes they were the nine minutes in this season when the opponent was better against us. They remain a good club, a good team."
Guardiola added: "They can create two or three really great chances in two or three minutes. If you play in a really good team like Arsenal and are 2-0 down, anything is possible.
"People think '2-0 you don't have a chance in Munich', but that's the main problem for us.
"They have (Per) Mertesacker, (Tomas) Rosicky, (Kieran) Gibbs, (Mikel) Arteta - a lot of very good players.
"I do not want to see Ozil control the game. That will be a big problem for us.
"This is not an easy game. We have to attack, give our best, be aggressive without the ball."
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