Cape Town - Bayern Munich manager Pep Guardiola admits his side will have to "take risks" if they are to overturn a 3-1 deficit against Porto on Tuesday night.
The Bavarians face a stern test when they face the Portuguese giants in a crucial clash at the Allianz Arena on Tuesday night. The German outfit must score three goals and keep a clean sheet if they are to progress to the semi-finals of the competition.
And Guardiola is acutely aware that an attacking approach could leave his side vulnerable at the back.
"Obviously it's a huge challenge, but you don't want to waste time thinking about it," the former Barcelona boss said.
"We simply need to play well and show courage, and then we can get the result we need.
"But we'll have to take risks. It's not easy to turn around a 3-1 deficit in the Champions League."
Bayern are still without the services of several key first-team players, meaning those who are currently available will have their fitness levels severely tested. However, Guardiola feels the match will be decided by "minds", not "legs".
He added: "Porto will have the fresher legs, but the match will be decided not by legs, but by heads."