United manager Simon Grayson has a number of injury doubts ahead of Tuesday's trip to Tranmere Rovers.

Shane Lowry, Richard Naylor, and Mike Grella all missed Saturday's game against Brentford due to injury while defender Andrew Hughes was withdrawn shortly after half-time, after succumbing to the effects of an illness which almost saw him ruled out from the start.

"Hughesy went off ill, but full credit to him that he started the game because he did well," said the boss.

"Shane had a problem with his knee. It's something he's had before and it was swollen on Friday. Mike Grella also picked up an injury on Friday which meant he was out as well.

"Richard Naylor picked up a thigh injury against Huddersfield last weekend and that's why he was out.

"We'll keep an eye on all of them and see how things go."