Arsenal briefly rose to second in the Premier League with their 4-0 victory at Bournemouth to finish off September, but it may have come at a price.
The Gunners were exceptional at both ends of the pitch, keeping another away clean sheet while scoring the most goals they have in a top-flight game all season.
Bukayo Saka started it off with his 17th-minute opener, but after starting despite being considered a "doubt" for the match, he was withdrawn during the closing stages after a challenge from Milos Kerkez.
Mikel Arteta said the 22-year-old winger would have to be assessed but named him in the starting line-up for Tuesday's Champions League trip to Lens on Tuesday, despite Manchester City lying in wait in the Premier League this weekend.
Saka started the game impressively, laying on Gabriel Jesus' opening goal, only to run into further problems
