Southampton goalkeeper Fraser Forster is ahead of schedule in his return from injury, according to manager Ronald Koeman.

The England international underwent a patellar tendon knee surgery after he suffered an injury during the Premier League game against Burnley in March.

"He's doing very well, everything is going to plan and it is fast," Koeman said.

"I don't want to say he will be back in four weeks but it's going good. He could be part of the group in four or five weeks."

"He has worked very hard and is already training with Dave Watson, and that's real goalkeeper sessions.

"Everybody is happy with how he is and that he's recovering well. We know it takes a long time to recover to 100 per cent but he will come back.

"He's coming back from April which is a long time. He needs continued training and his first game will be in the Under-21s.

"That's the same for everybody, goalkeepers, defenders and midfielders. Everybody plays in the Under-21s first."