A question of volume by Thibaut Courtois against a moment of magnificence from David Raya? It's the Arsenal man who just shades it, his double save from Mateo Retegui's penalty was that good. Admittedly the header on the rebound by the Atalanta striker was as tame as you will see in the Champions League this season but Raya still had to scramble halfway across the goal after what was a very good initial save.

After match day one of the newly formatted Champions League, our writers answer the burning questions, provide analysis and break down performances.