Laurent Blanc will be without his star center back and captain for the foreseeable future, after the Brazilian picked up a hamstring injury against Napoli on Monday.
The Brazil international limped out of the Ligue 1 champion's 2-1 friendly victory over Napoli on Monday night after just 14 minutes of action.
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The PSG captain underwent more tests on Tuesday and it has now been confirmed that coach Laurent Blanc will be without one of his key players for a prolonged period of time.
"Examinations carried out on Thiago Silva (ultrasound and MRI) have confirmed that he has suffered a muscle injury in his right hamstring. He will be out for several weeks," a brief club statement read.
Blanc admitted in the wake of the victory at the San Paolo that Thiago Silva's injury had cast a shadow over his side's well-earned victory.
"The shadow over the evening though, is, of course, the injury to Thiago Silva," the World Cup winner conceded. "This sort of thing happens. He will be given the best care because we will need him."
Despite playing the friendly against Napoli, PSG began its Ligue 1 campaign against Reims last Friday, drawing 2-2. The club hosts Bastia this weekend.