Rio Ferdinand could be back in action against Sheffield United despite limping out of Saturday's FA Cup semi-final victory with a groin injury.
The Reds' defenderaggravated the knock he picked up against AS Roma last week, but Sir Alex Ferguson has confirmed that he is in with a chance of facing Neil Warnock's men.
Ferdinand was replaced against Watford by Darren Fletcher, who filled in at right-back while Patrice Evra switched to his favoured left-back berth. Gabriel Heinze completed the emergency manouevres by joining Wes Brown in the centre.
Of the other defenders on the treatment table, Gary Neville (ankle) and John O'Shea (calf) are expected to return sooner than Mikael Silvestre and Nemanja Vidic (both shoulder).
Eighteen year-old centre-back Craig Cathcart gives Sir Alex another option. Recently given squad number 32, Cathcart is likely to keep his place on the bench on Tuesday night.