The promising young keeper damaged his knee in the summer and despite undergoing corrective surgery in June, he is still a ways away from being available as an alternative for first-choice keeper Edwin Van Der Sar.
“It’s going to take time with Ben,” admitted Ferguson. “The prognosis of the specialist is that we should see him back in March.
“It’s difficult for him but you have to handle it. It will definitely add to his experience.”
No one will be more frustrated at the slow rate of recovery than Foster, 24, who is yet to play a single game for United since returning from his two-year loan at Watford.
The latest news from the infirmary concerning team skipper Gary Neville is considerably better, however, and the defensive veteran could be back in action as early as next week after a grueling ten months on the sidelines.
“Gary will play in the reserves against Everton on Wednesday,” Ferguson added.
“After that, we’ll have a clearer idea of what to do in the next few games, including the one in Saudi.”
Manchester United have a friendly lined up against Saudi powerhouse Al Hilal in Riyadh on 21st January.