Gabriel Jesus continued his love affair with the Champions League with a fine goal and assist as he led Arsenal to a 2-1 victory over Sevilla.
Borussia Dortmund and AC Milan battled fiercely to a 0-0 draw on UEFA Champions League matchday 2 in Group F on Wednesday.
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.