VIDEO: Bayern Munich puts 3 goals past Olympiacos in opening 20 minutes

How do you stop Pep Guardiola's raging Bayern Munich side? If you're Olympiacos, well ... you don't.

The Bavarian outfit made short work of their opposition in UEFA Champions League Group F action, scoring three goals in the first 20 minutes of play.

Douglas Costa opened the scoring in the eighth minute, driving in a rebounded ball that smacked the post on the way in. Eight minutes later, Robert Lewandowski scored, accidentally robbing Kingsley Coman's shot with his feet, but making up for it with a smart finish.

Not to be outdone by his teammates, Thomas Muller notched a third on the 20-minute mark, finishing off a series of passes, flicks, crosses, and headers with his tap-in goal.

Poor Olympiacos never really stood a chance, something Arsenal fans will be rather pleased with, as Bayern winning by a big margin helps the Gunners' qualification cause tremendously.