​​Arsenal striker Alexandre Lacazette is expected to miss between four and six weeks with a knee injury, the ​club have confirmed.


The Frenchman had an arthroscopy on his left knee in London on Tuesday morning following ​Saturday's 1-0 defeat against Tottenham.


The minor procedure was reportedly a success and the 26-year-old will now undergo a period of rehabilitation.

The injury blow comes following a disappointing run of form and a run of just one goal in ten league games.


Lacazette was criticised after Saturday's North London derby loss after missing two chances in the second-half.


And manager Arsene Wenger admitted after the game that the arrival of Pierre-Emerick Aubameyang might have had an impact on his confidence.


"For him, one against one with the goalkeeper, he is a good goalscorer," said Wenger - quoted by the Independent. "He has gone through difficult periods before. He works hard in training, works on his finishing.

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"I don't know what happened, did he not touch the ball well? It can happen, it is a fraction of a second.


"Maybe the confidence is not at its highest because he has seen a competitor [Aubameyang] coming in for him."


He added: “He created two chances today. That is a quality as well. He will score goals. He is a goalscorer, he scored goals in his whole career. He will score again.”


Lacazette has scored only nine goals in 26 ​Premier League appearances this season since his £55m arrival from Lyon last summer.

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