Arsenal have suffered defeat for the first time this season, losing 2-1 to Lens in their Champions League group game on Tuesday night.
The Gunners, who were unbeaten in their previous 11 games, took the lead through Gabriel Jesus.
However, they were pegged back by Adrien Thomasson’s equaliser after David Raya’s poor pass out the back.
Mikel Arteta’s men, who looked off-colour, failed to generate too many clear-cut chances and were made to pay when Sepe Wahi steered home the winner for Lens with just over 20 minutes to go.
Kai Havertz, Leandro Trossard, Reiss Nelson and Emile Smith Rowe came close to adding to Arsenal’s account.
Arsenal have dropped to second in the group, one point ahead of Sevilla after their draw at PSV Eindhoven.