Arsene Wenger believes that Alexandre Lacazette’s knee injury is why he was in poor form, as per a report in GOAL,

Earlier this week, it was announced that Lacazette was ruled out with a knee injury for at least a month, and his manager feels that there was a problem with his knee beforehand, which is why he has been poor in front of goal recently.

Wenger brought on Lacazette for 25 minutes in the North London derby and although he didn’t show any sign of injury, he did miss a very big chance in the dying embers of the game, which would’ve brought it back to 1-1.

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Wenger said

He got a surprising swell of the knee after the game against Tottenham and needed surgery, very quick surgery, and he will be out for the next four or five weeks, it’s a massive blow for us, but we have to find a solution.

He added by saying

Nobody could predict that, but football is as well to do with unpredicted things and it’s always a good opportunity to find someone who steps in and does well. Lacazette is down, but I think he recently must’ve felt something in his knee, I don’t know. Maybe as well that’s an explanation why he was not scoring as many goals as he’s used to.

Arsenal fans will be hoping that Lacazette comes back and shows the form which he showed at Lyon, as many have been disappointed with him this season.