The Gunners, whose chances of advancing looked remote after defeats by Dinamo, Olympiakos Piraeus and Bayern Munich in their opening four matches, were given a huge helping hand by Bayern Munich who thrashed the Greeks 4-0 in the other Group F match.
Those results mean that Bayern are through to the knockout round and Arsenal will join them if they beat Olympiakos by two clear goals in Greece on 9 December.
Bayern have 12 points, Olympiakos have nine, Arsenal are on six and Dinamo have three. If Olympiakos gain at least a point against Arsenal they will go through instead of the London side while Dinamo are already eliminated and will finish bottom.
