Friday's training session will decide whether Nemanja Vidic is fit enough to face Fulham this weekend.
The Serbian defender was substituted during Tuesday's win over Wolves at Old Trafford, after straining a calf, but Sir Alex Ferguson is hopeful of a swift recovery.
"We're waiting on Nemanja Vidic," said the manager at his pre-match press conference. "Hopefully he'll be okay for tomorrow but he needs to train today."
Wes Brown will also miss Fulham, and presumably the Christmas weekend trip to Hull City, given the manager's assessment that "he should be available in ten days" following the hamstring injury which kept him out against Wolves.
Gary Neville could be back for Hull - "he's not far away, maybe seven days" - as could fellow right-back Rafael, who started training this week.
Edwin van der Sar will not be available to play against his former club - the boss revealed his first-choice goalkeeper has flown to his native Netherlands where the national team doctor will assess his knee injury.
Nani is also ruled out for a couple of weeks, due to an ankle injury sustained against Wolfsburg on 8 December.
The news on longer term injuries is that Rio Ferdinand is "a lot better" and may be fit within the next two to three weeks. However, John O'Shea and Jonny Evans are unlikely to play until late January and there's a similar estimate for Owen Hargreaves.