The Spanish giants hold a 3-0 lead following the first leg of their Champions League semi-final at the Camp Nou last week, with the Bavarians needing to open the floodgates at home in order to progress into the Final.
Injured wingback David Alaba is confident his side can do the business, and hopes to be fit for what will be a home Final for the German club.
"We'll win 4-0 and I hope I'm fit to play the final in Berlin," he was quoted as saying by AS.
Bayern trailed 3-1 in their first leg quarter-final against Porto, yet managed a 6-1 win at home, and defender Medhi Benatia feels with the right attitude, Bayern can repeat that feat against their Spanish opponents.
"It won't be easy, but whomever doesn't believe would be better off staying at home," said the Moroccan international.
"We've got a great team and we can score a bucket-load at home. We've proven it."
Kick-off is scheduled for 20:45 tonight in Munich.