Captain Silva suffered a hamstring problem in a 2-1 friendly win over Napoli on Monday, the Brazil international’s second game in four days after he featured in the Ligue 1 champions' season-opening 2-2 draw at Reims last Friday.
The 29-year-old's return came after he missed all of PSG's pre-season preparations following his World Cup exertions with Brazil.
"For me no, he did not come back too soon," Blanc said at a press conference ahead of Saturday's Ligue 1 clash with Bastia.
"Much has been said about this injury, looking for the perpetrators. I'll take the blame."
"As long as the transfer window is not finished, something can still happen," Blanc added.
"Honestly, the main transfer window is already finished since we signed Serge [Aurier] and David [Luiz].
"If the number [of signings] remains as it is, I will be very happy.
"I knew that few players would come to PSG. There will be a third if ever a player wants to leave."
