This is how Arsenal can still qualify for the Champions League knockout stages

Arsenal's Champions League hopes hang in the balance after their 3-0 win over Dinamo Zagreb.

Arsene Wenger's men romped to victory after a brace from Alexis Sanchez and Mesut Ozil's diving header.

That, coupled with Bayern Munich's easy win over Olympiakos means it is set for a final day decider in Athens in a fortnight.

Pep Guardiola's men won 4-0 against the Greek side to ensure their qualification, with all to play for between Olympiakos and Arsenal.

Well the Gunners have secured a Europa League spot after their victory over Zagreb ensured third spot.

Then comes the crunch. Arsenal head to Greece on December 9, knowing they must win.

And not only that, they must win by two clear goals to take the head-to-head record, which will act as a decider (not goal difference).

So 1-0 to Arsenal in Greece wouldn't be enough. Nor would 2-1. They have to win 2-0, 3-1, 4-2 etc.

Otherwise, it's curtains.

In short, Arsenal must beat Olympiacos by two clear goals.