WATCH: Arsenal pull off a great escape to hurtle into the knockout stages

Olivier Giroud scored a hat-trick in Greece, while Chelsea earned some respite

Olivier Giroud, Mesut Ozil, Arsenal

Ozil and Giroud celebrate (AP Photo/Petros Giannakouris)

Olivier Giroud scored a hat-trick as Arsenal qualified for the Champions League knockout stage after a 3-0 win at Olympiakos tonight.

The Gunners came into tonight's win, knowing a 2-0 win would overturn what had looked like a doomed campaign in Europe.

But they went one better with Giroud's triplet of goals, including a penalty capping off a famous night for Arsene Wenger's men in Greece.

 

 

 

 

 

They qualify second from Group F behind Bayern Munich, who won at Dinamo Zagreb.

Meanwhile, Chelsea topped Group G after a 2-0 win at home to Porto.

An own goal set the Blues on their way, before Willian added a second.

Champions League scores

Bayer Leverkusen 1-1 Barcelona

Olympiakos 0-3 Arsenal

Chelsea 2-0 FC Porto

Valencia 0-2 Lyon

Roma 0-0 BATE Borisov

Dinamo Zagreb 0-2 Bayern Munich

Dynamo Kiev 1-0 Maccabi Tel-Aviv

KAA Gent 2-1 Zenit