Arsenal travel to the Bundesliga champions for the first leg of their last-16 encounter tomorrow night (7.45pm).
The Gunners face a tough test, with Bayern having knocked out Arsene Wenger's side at this stage of the Champions League in two of the last four seasons.
Arsenal also lost 5-1 when they last visited Bayern in the Champions League group stage last season.
Bayern Munich star Arjen Robben is expecting a tough match with Arsenal
They [Arsenal] are a threat to everybody who is in the Champions League
Bayern Munich star Arjen Robben
But former Chelsea man Robben insists Arsenal have improved and will pose a difficult test for the German giants.
“There are 16 teams left and of those 16 teams maybe there are seven or eight who can win it, realistically,” Robben told The Telegraph.
“Maybe a big surprise will win it and I’m not being fair on the other seven or eight teams.
"In the Champions League only one weak 45 minutes and you are out.
Arsenal line-up predicted to face Bayern Munich
Mon, February 13, 2017
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Arsenal lost 5-1 at Bayern Munich last season
"Arsenal? “I think they have improved again compared to last year and, of course, we have faced them over the last few years and have always won or went through to the next round.
"But I think this is maybe going to be the most difficult one because of their status at the moment.
"Their level has risen again… They are a threat to everybody who is in the Champions League, they can make it difficult for everyone.
"We are confident, of course, but it’s going to be a 50/50 one.”