"Sergio is in Argentina but he will come back on Sunday.
"Vincent is not in our plans for tomorrow. But I think he will be ready for the Newcastle game, like Sergio."
Mancini accepted Kompany's injury has proved rather more serious than initially believed.
"It is difficult," added Mancini. "Vinny is a really important player for us and now it is 45 days he has been out. It is a big problem."