Wayne Rooney is expected to be back for Newcastle’s visit to Old Trafford on on Saturday, having missed Tuesday’s 2-2 draw with Benfica.
But it is in midfield where Sir Alex faces the most problems.
“Anderson is not fit until February. He’s been sent to Portugal to see a specialist who operated on him before. Not good news.”
Despite Tom Cleverly also being sidelined until Christmas, the Scot thinks he has a strong squad to cope,
“He (Anderson) and Tom Cleverly are the two midfielders out for a while now, and Michael Owen is also out.
“We’re not as bad as people think we are in midfield.
“Vidic is back, of course, Smalling’s fitness is a boost and Rafael is also back, so the defensive part of the team is OK”