Nottingham Forest striker Nathan Tyson has picked up a hamstring injury and could miss the start of the season.Forest boss Colin Calderwood admitted: "It's unfortunate, because we'd done a lot of work with him and we felt he was in tip-top condition. But he's felt it again slightly, so we've had another scan and we can take things from there once we have the results.
"Last year, it looked as though he'd be out for a considerable period and he wasn't, because we were able to manage the situation. Hopefully we'll be able to do the same thing again.
"I don't think there's a way to cure the problem permanently, he's just so finely tuned. We'll have to accept that it's part of his make-up."
