Matches will be played almost every day according to a new fixture list the league released on Saturday.
Forward Rasmus Hojlund scored twice to allow Manchester United to come back from a goal down and get a 2-1 win at six-times Czech champions Viktoria Plzen in the Europa League on Thursday.
Ireland stunned world champions Germany 1-0 thanks to Shane Long's 70th-minute strike on Thursday to throw Euro 2016 qualifying Group D game.
Images from UEFA Champions League matches played on Wednesday.
A summary of the UEFA Champions League Group Stage action, on Wednesday.
Arsenal might be struggling in the Premier League but they are 100 per cent in Group B of the Europa League
Sweden's Helsingborg and Greek side Panathinaikos became the first clubs to reach the knockout phase of the UEFA Cup on Thursday while former European champions Bayern Munich missed their chance to reach the last 32, a 1-1 draw in Portugal against Braga ensuring the Bundesliga leaders still have work to do to qualify from the group stage.
