The Belgian was ruled out of his country's final two World Cup qualifiers after picking up the problem in City's 3-1 win over Everton earlier this month.
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"Vincent is working hard. He is not ready to play but I hope that next week he will do," Pellegrini said on Friday.
"(Martin) Demichelis played 45 minutes with the Under-21s on Wednesday, I think he's in the same shape as Kompany, I hope that next week he'll be ready."
However, Pellegrini can call on Jack Rodwell in midfield after the former Everton man recovered from a hamstring injury.
"Jack Rodwell has no problems, he is fit," the Chilean added.