It's judgement day for Chelsea and Arsenal in the Champions League on Wednesday, with both sides requiring positive results from two tricky looking fixtures.
The Blues know that while a draw at home to FC Porto should be enough for qualification to the next round, they will likely require a win to top the group and avoid the big guns in the last 16.
The Gunners, however, must beat Olympiakos in Greece by two clear goals to ensure they don't fail to progress beyond the first group stage for the first time since 1999.
Elsewhere, Roma, Bayer Leverkusen and BATE Borisov will battle it out to qualify behind Barcelona, with the Germans facing the toughest task as they host the Catalan giants.