Bayern are currently top of Group E and have been tipped by many people to win the competition next May.
However, despite the fact that his team are the underdogs against "probably the best team in the world", Garcia has claimed that his players will not be fazed by the occasion.
"We are still outsiders in Group E, but we are aiming for the round of 16. Bayern are probably the best team in the world but we have no fear. We have good players and amazing willpower. We have watched a lot of Bayern matches. Every detail can be important in a match like this," he told reporters.
Roma head into the encounter second in the group with four points to their name.