Leeds United were due to make a final assessment of Andy O'Brien's fitness today with the defender "touch and go" for the clash with Championship leaders Queens Park Rangers.
O'Brien, pictured inset, is a major doubt for the visit of QPR to Elland Road after suffering a thigh strain in training last week, and manager Simon Grayson said he would not risk the 31-year-old if concerns about his condition persisted this afternoon.
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The on-loan Bolton Wanderers centre-back has been a pivotal figure in Leeds' run of eight matches without defeat but he missed Saturday's 3-2 win at Burnley and may be absent for a second successive game tomorrow.
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Grayson said: "He's touch and go. Like any of our injuries, whenever anyone is carrying a knock they need to be nearly 100 per cent to play.
"He's in with a chance but he's still a doubt. We'll assess him again but if there's any doubt about him, he won't play."
Neill Collins replaced O'Brien in the centre of defence at Turf Moor and the former Preston North End player will partner Alex Bruce again if O'Brien fails to recover in time to play.
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O'Brien's role in United's resurgent form, which began on the day of his debut at Scunthorpe United, has been widely acknowledged, but Leeds' dramatic win over Burnley was achieved without him in their squad.
Grayson said: "He's shown a lot of quality and people are talking about the run being coincidental with him being in the team. But it's nice for the other players to win without him because it is a team game."
United's injury concerns are concentrated solely on their ranks of centre-backs, with Richard Naylor and Patrick Kisnorbo recovering from surgery and unavailable this weekend. The club have no other selection problems.