Sir Alex is convinced Edwin van der Sar’s return to action will soon settle United’s back four.
The Reds haven’t managed to keep a clean sheet at Old Trafford in the league since the opening day of the season but the United boss is confident stability is just around the corner.
“I think the key is having Edwin back,” he told reporters on Friday. “He’s a marvellous goalkeeper and it’s incredible to think that at 39 years of age he still has the fitness and motivation to play all the time.
“I think his return to the side will make a big difference. That will settle things.”
Van der Sar may find himself marshalling an unfamiliar defence when Blackburn come to Old Trafford on Saturday. Sir Alex revealed Rio Ferdinand and Nemanja Vidic are both “doubtful” with calf injuries, while Gary Neville is suspended after his red card at Barnsley.
And although Blackburn have found life difficult away from home this season – four losses in four games – Sir Alex isn’t expecting an easy ride from Sam Allardyce’s men.
“They’re always difficult to beat and I think Sam has built a different team from Mark Hughes’ Blackburn team,” the boss said.
“Sometimes it takes a manager time to get rhythm at a club. They’ve lost some important players in Brad Friedel, Stephen Warnock and David Bentley.
“But I think the interesting thing is how Sam is using David Dunn now – I think he’s found the right position for him. He‘s done very well this season and he’s an obvious threat for us tomorrow.”