Arsenal got their Champions League campaign off to a disappointing start on Thursday night as they drew 0-0 with Atalanta in Italy.
Mikel Arteta's side had to call on David Raya to pull off a fine double save from Mateo Retegui as they were forced to defend for large periods without the ball.
They struggled to create chances at the other end of the pitch in the absence of captain Martin Odegaard, as the Europa League winners got the better of the Premier League title chasers for large parts of the game.