"He is not fit. Let me say it like this, last year he already had a few problems with that but he could obviously play - and played really good," Klopp told reporters after Liverpool beat West Ham United 4-0 in their Premier League opener.
"Now in the World Cup, (playing) three times (for) 120 minutes it got a bit worse, but I am pretty sure it will settle in the next one, two or three weeks.
"In that time he can probably for sure train already, but not the full programme, so that will then take time."
Lovren is likely to remain on the sidelines until after next month's international break, which means he will miss Liverpool's league matches against Crystal Palace, Brighton and Hove Albion and Leicester City.
(Reporting by Hardik Vyas in Bengaluru)
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