Arsenal put up a valiant fight at Inter Milan as a controversial penalty proved their undoing, but ultimately it was another disappointing result in what is proving a tough spell for the Gunners.
Tyrone Mings became the first Englishman to concede a penalty on his Champions League debut in bizarre fashion as Aston Villa lost to Brugge.
At the halfway stage of the revamped Champions League's new 36-team league phase, who is on track to progress and who could be in danger?
Watch as Aston Villa defender Tyrone Mings gifts Club Brugge a penalty to take the lead in the Champions League with an 'extraordinary' handball after picking up a pass from goalkeeper Emiliano Martínez.
Watch highlights as Arsenal's stuttering start to the season continues as they slump to a 1-0 defeat to Inter Milan at the San Siro after a first-half penalty from Hakan Calhanoglu.
Watch highlights as Aston Villa suffer a 1-0 defeat by Club Brugge in the Champions League after Tyrone Mings gives away an "extraordinary" penalty.
