ARSENAL, Manchester City and Celtic are in Champions League action tonight - but what are the permutations of their matches?
Arsenal
Arsenal have qualified for the last 16 with two games to spare so can rest easy tonight against Paris Saint Germain - sort of.
A win over PSG at the Emirates would guarantee top spot in the group and could hand them a favourable draw in the next round.
However with the current teams in second place in other groups it could all back-fire for the Gunners.
Bayern Munich and Real Madrid are both second and it would be typical of Arsenal to draw one of those the year they finally win the group.
While they have the same points as PSG at the moment whoever wins tonight's game will finish top due to the head-to-head format.
If they draw again - as they did in Paris - it will go down to the final game week.
Arsenal finish away at Basle on 6 December while PSG host Ludogorets on the same evening.
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Manchester City
Manchester City will qualify for the last 16 with a victory at Borussia Monchengladbach tonight and a point would be enough if Celtic fail to beat Barcelona.
City, who beat Barca in their last outing, sit on seven points with two games left.
That win, coupled with Monchengladbach's failure to beat Celtic in the last match, has made their route into the next round easier.
City are currently three points clear of the German side and even though a draw would only maintain that three point lead they would progress due to the head-to-head rules, having beaten them 4-0 at the Etihad in September.
However were Celtic to beat Barcelona and City fail to win it would go down to the final game between the two on December 6.
Celtic
Celtic have to beat Barcelona to have any hope of making the knockout round.
They currently have just two points having started their campaign with a 7-0 defeat to tonight's opponents.
However the draw with Monchengladbach in Germany has kept the faint hope alive.
Their task is simple - win and hope Manchester City don't, otherwise they're out.
They will still be in the running for a Europa League spot even with a defeat tonight - but only if Monchengladbach get beaten by City.
Celtic are two points below the Germans but have a worse head-to-head record so must finish with more points than them to continue playing in Europe this season.