Manchester City manager Manuel Pellegrini expects to be without Joe Hart and Raheem Sterling for "three or four weeks" after they sustained injuries in Sunday's 1-0 loss to Manchester United. Sterling went off with a groin injury in the 26th minute at the Etihad Stadium, while Hart had to be stretchered off after damaging his calf as he made a clearance early in the second half. Pellegrini said that both were likely to miss England's forthcoming friendlies against Germany and the Netherlands, and he now faces a nervous wait to see if they will be fit to face Paris Saint-Germain in next month's Champions League quarterfinal. "Both of them have muscular injuries. Raheem it's his groin and Joe his calf," Pellegrini told reporters. Asked if the pair would be fit for England duty, he replied: "I don't think that with a muscle injury you will be fit in one week. Normally it's three or four weeks." It was the second match in succession that City had lost two players to injury, after captain Vincent Kompany and fellow centre-back Nicolas Otamendi were forced off against Dynamo Kiev on Tuesday. City were already missing midfielders Kevin De Bruyne, Samir Nasri and Fabian Delph due to injury.