Rio Ferdinand is out for at least another two weeks after hospital scans on his thigh injury.
The Manchester United and England centre-back missed United's opening game, their 1-0 win against Birmingham at Old Trafford.
Monday's medical report means Ferdinand will be sidelined for Wednesday's trip to Burnley, along with the games against Wigan and Arsenal at home.
The defender is also now a doubt for England's World Cup qualifier next month against Croatia.
United manager Sir Alex Ferguson said on his defensive crisis: 'Jonny Evans is injured again, Gary Neville has only just started training, and Rafael da Silva is still missing with his dislocated shoulder.
'But Nemanja Vidic is back in training and should be back on Saturday.'