United boss Simon Grayson says he has a number of injury doubts ahead of the weekend trip to Millwall - but is staying tight-lipped over who is a concern.

United head for the Den on the back of a confidence boosting 4-1 win against Nottingham Forest last weekend.

Paddy Kisnorbo remains the only known casualty as he continues his recovery from an Achilles injury, sustained against the same opposition at Elland Road 13 months ago.

"We've got a few injury concerns," confirmed the boss.

"We took a few knocks last weekend and some didn't train until Thursday. One might not train until Friday, but we'll see how everyone is.

"We've got a good squad with some good cover and good competition, and if there's any doubts players won't play if they aren't fit."

Striker Billy Paynter is set to serve the second of his three-game suspension at Millwall.