Phil Jones appeared in distress as he left the field with an injury
Jones started against Burnley tonight but hobbled off just five minutes into the game with what appeared to be an ankle knock, although it could have been a recurrence of him hamstring strain that dogged him last year.
His replacement Chris Smalling scored with his first touch as United bagged the opener at Old Trafford.
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But United fans will no doubt be worried over Jones' fitness heading into a crucial period as Louis van Gaal's men chase Champions League football.
Jones has started 10 of United's last 12 games, having missed much of the start of the season through injury.
United suffered another injury in the first half as Daley Blind took a blow to the head and was patched up by the club medical staff.
However, the Dutchman couldn't last until the break as he came off for Ander Herrera.
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