Andre Onana and Harry Maguire were the unlikely heroes as Manchester United secured a 1-0 victory over FC Copenhagen in the Champions League at Old Trafford on Tuesday.
Barcelona made it two wins from two in the Champions League after Ferran Torres netted the winning goal in their 1-0 win over FC Porto at Estádio do Dragão.
Julian Alvarez and Jeremy Doku netted late goals as Manchester City secured a well-deserved 3-1 victory over RB Leipzig in the Champions League.
Newcastle United celebrated the return of Champions League football to St. James' Park by defeating Paris Saint-Germain in front of an electric crowd in Tyneside.
Elye Wahi played a starring role in helping French side Lens come from behind to secure a shock 2-1 victory over Arsenal in the Champions League.
Manchester United's struggles in the Champions League continued after they suffered a 3-2 defeat to Galatasaray at Old Trafford on Tuesday evening.
Jude Bellingham scored an injury-time winner as Real Madrid defeated Champions League debutants Union Berlin 1-0 at the Santiago Bernabeu on Wednesday.
Arsenal marked their return to the Champions League in style following their 4-0 hammering of PSV Eindhoven at the Emirates Stadium on Wednesday evening.
Paris Saint-Germain got their Champions League campaign off to a winning start following their 2-0 victory over Borussia Dortmund at the Parc des Princes on Tuesday.
Julian Alvarez played a starring role to help Manchester City come from behind to beat Red Star Belgrade 3-1 as they began their Champions League defence at the Etihad on Tuesday.