Bruce Allen has said that it is too soon to predict whether Robert Griffin III will be fit for the start of the Washington Redskins' training camp.

The quarterback is a doubt for the start of the 2013 season having undergone knee ligament surgery earlier this year.

The team's general manager told reporters: "It's too early to tell right now. He is doing everything that the doctors want him to do. He's a great worker. I think that's why there's so much optimism that he'll be ready at the beginning [of training camp].

"But it's really too premature to speculate on where his medical condition is until we give him a physical when training camp starts July 25.

"He's been doing a lot of drill work on his own with the other injured players. He has to just follow the doctors' and the trainers' advice on a daily basis."

Griffin tore two ligaments during the Redskins' loss to the Seattle Seahawks in the playoffs in January.