Bayern Munich chairman Rummenigge: Arsenal are struggling
He is confident they go into the tie as favourites.
Rummenigge said: "We enter this match as the slight favourites, but we can't make the mistake of underestimating them.
"Arsenal have struggled at times in the league over the last few months, which a look at the standings in the Premier League will tell you. But by no means will this be an easy game for us."