Arsenal fell to their first defeat of the season, despite taking the lead in France on Tuesday night.
The Gunners were below par all night but RC Lens were clinical in the box, scoring two goals from just 0.6 expected goals. Arsenal, who created more than double that, could only score once, through Gabriel Jesus.
Arsenal now travel to Sevilla in the next matchday is what is a must not lose for both teams, with Sevilla on just two points and Arsenal on three, with Lens leading the group on four.
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Gabriel Jesus put the Gunners ahead on 14 minutes, but after the hosts equalised through Adrien Thomasson, who curled into the far corner, beating an underwhelming David Raya with ease, squandered chances cost us the points, when Elye Wahi netted at an atmospheric Stade Bollaert on Tuesdy evening.
Firstly congratulations to Lens,” Arteta said after the match.
“They are a really good side, we knew that, we expected a really tough match, and we faced a really tough match.
“We made the most difficult thing – scoring the first goal – we were in total control of the game, that’s when we conceded the goal.
“After that we had four or three big chances to score and in Europe you have to kill the game when you have those chances.
Against PSV in both boxes we were exceptional and today we haven’t, and when we haven’t done it in one area, in our own area, to concede the second goal was poor.
“We knew that was going to be a battle, you see the atmosphere, you see the team that they are, what they have done last season.”
Arteta’s side host Manchester City in a crucial Premier League fixture at the Emirates on Sunday