Per Mertesacker was involved in a training ground clash with Yaya Sanogo [GETTY]
The Gunners were left battered and bruised after Liverpool thumped them 5-1 on Saturday.
And it has emerged from the Anfield wreckage that Arsenal star Mertesacker was involved in a training ground row with Sanogo earlier this month.
Mertesacker picked up a black eye during the clash, although reports suggesting Sanogo headbutted the German are thought to be incorrect.
Sanogo has made just two appearances for Arsenal [GETTY]
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The incident is said to have taken place during a training session at Arsenal's London Colney HQ before Wenger's men beat Crystal Palace 2-0.
But Mertesacker had claimed his black eye came about because of an accidental collision with goalkeeper Wojciech Szczesny.
After the game, Mertesacker tweeted: "Sorry guys, this was a bad day for the whole team. Now we have to stand together in defeat and get our heads sorted again."
Arsenal will not be punishing Sanogo over the clash.
sorry guys, this was a bad day for the whole team. No we have to stand together in the defeat and get our heads sorted again.
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