Manchester United midfielder Owen Hargreaves is facing long-term career doubts, it is reported.

BBC Sport says Hargreaves may be forced to quit top-level football in the next two years if his chronic knee problem persists.

The United and England midfielder has had two operations to cure a tendinitis problem in both knees but the pain has yet to subside.

It is believed the 28-year-old has not yet planned a return date but is still confident of making a full recovery.