Derby forward Nathan Tyson is set for another spell on the sidelines after his groin problem flared up again.

The 29-year-old, a summer signing from East Midlands rivals Nottingham Forest, had to wait until last weekend to make his debut for the Rams after suffering a groin injury during pre-season.

Tyson came on as a second-half substitute against his old club nine days ago but aggravated the injury at the City Ground and subsequently missed the 3-0 home victory over Millwall on Saturday after undergoing what Derby called a 'small procedure'.

He is not expected to be fit again until after the international break when Nigel Clough's side host Southampton.

"Nathan was struggling after the Forest game and so he has had a small procedure, which cannot really be called an operation, and it will be a three or four-week turnaround," said Rams boss Clough. "He has a chance of being available for the Southampton game, or realistically just after that. His lay-off will encompass the international break.

"The most important thing is to get Nathan right for the season. We feel he is going to have a big part to play in our campaign and at the moment, the injury is causing him, and us, a fair bit of frustration. The best thing is to make sure he is right when he comes back."

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