Ranko Stojic revealed the France forward has undergone a knee operation in America in a bid to repair an injury which contributed to his disappointing season last term.
Stojic told the Manchester Evening News: "Louis has had surgery in America and he won´t be on the field now for a few months. I don´t know when he will be able to start training again but he is looking at being back around November or December. But it is going to be a while."
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