Ferdinand sustained the injury in Sunday’s 2-1 win over West Brom at The Hawthorns.
United boss Sir Alex Ferguson has also revealed that Nemanja Vidic will be out for ‘a couple of weeks’ after sustaining a calf problem against the Baggies.
Ferguson also revealed that Rafael will be out for 10 weeks after he dislocated a shoulder in training ahead of the clash with the Baggies.
Ferguson told Sky Sports: “We’ve had a rough time with injuries.
“Young Rafa has done his shoulder in training in Friday and will be out for 10 weeks, he’s probably going to have an operation.
“Rio will be out for six weeks. Vida will have checks tomorrow, we don’t know if it’s just a nerve or something, but he could be out for a couple of weeks.”
