Manchester United fell to an error-ridden 3-2 defeat at home to Galatasaray as Erik ten Hag's side saw their start to the season go from bad to worse in an embarassing Champions League collapse.
Arsenal suffered a turbulent night in the Champions League as Bukayo Saka hobbled off during a 2-1 defeat in Lens.
Real Madrid coach Carlo Ancelotti anticipates a tough test for his squad as they face Napoli in a UEFA Champions League group stage encounter.
Arsenal are having to endure travel delays ahead of the club's first away game in the Champions League in six-and-a-half years.
In a nail-biting UEFA Champions League opener, Real Madrid displayed their tenacity as they secured a dramatic 1-0 victory over Union Berlin.
In a UEFA Champions League clash, Real Madrid's Jude Bellingham delivered a stunning last-minute goal to secure victory over Union Berlin.