Arsenal tied Atalanta, Atletico Madrid completed its comeback with a late winner and 10-man Barcelona lost despite Lamine Yamal's first Champions League goal.

Barca won its first five league games in the Spanish league under new coach Hansi Flick but saw Monaco take the lead in the 16th through midfielder Maghnes Akliouche

Teenage sensation Lamine Yamal equalised in the 28th minute with an arrowed shot after cutting in from the right onto his favoured left foot, but George Ilenikhena grabbed the winner for Monaco inside the final 20 minutes.