Vermaelen has insisted that Arsenal are capable of competing against Bayern in the first leg of their last-16 tie but wants the Emirates crowd to create a positive atmosphere tomorrow night.
He told The Sun: "The result against Blackburn was terrible. It's normal the fans are disappointed but we need them to believe as well.
"We need their support 100% on Tuesday. Anything can happen in the Champions League.
"Is it realistic to win the Champions League? Why not? It's a tournament, I believe in our chances."
Bayern arrive in North London in top form after earning their 18th league win of the season at Wolfsburg on Friday night.