"There is no real timescale on it, but it is a proper muscle injury," Klopp said. "Different players recover differently. That is it pretty much. It is not a short one.
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"It is not that he will be in contention for next week or something like that. We have to wait a few more weeks, definitely, for him.
"He is working in the gym, not on the pitch, it is a rather serious one but not a season-ending injury."