PSG said on their website (www.psg.fr) on Tuesday that the Sweden striker picked up the injury during the team's 2-0 win against Olympique Lyonnais in the Champions' Trophy last Saturday.
"(Further checks) showed a sprained ligament in his right knee," the club said.
PSG kick off this season's Ligue 1 at Lille on Friday at 1830 GMT.
(Reporting by Julien Pretot; Editing by Toby Davis)
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