Manchester City blow as David Silva ruled out for up to four weeks with calf injury City manager Manuel Pellegrini, who has admitted to being "concerned" by Vincent Kompany's battle against a thigh injury, is faced with a mounting injury list, with Fernandinho and Matija Nastasic attempting to overcome fitness worries to play against Sunderland at the Stadium of Light on Sunday. Pellegrini said: "It was five weeks out for him, he is in his third week and it is two weeks more. We hope if he continues to work the same way he will not have any problem, but of course, we are concerned and we are trying our best to see what we can do. Pellegrini, meanwhile, has opened the door for Joe Hart to reclaim his place in goal should he impress for England against Chile or Germany. Hart has missed City's last three games after being dropped by Pellegrini in favour of Romanian understudy Costel Pantilimon, but the Chilean manager admits he will watch the goalkeeper closely when he plays for England. "I will watch him on TV," Pellegrini said. I don't know if Joe will play, but I'm sure if he plays, he will do very well. Could he return for us against Tottenham? We will see what happens. For the moment, we are playing with Pantilimon, but we are all supporting Joe Hart and he will come back, but I can't say when. He deserves to be in the England squad. He has been No 1 for the whole of the World Cup qualifiers, so he must be there.