The Colombian forward joined the Red Devils on loan from Monaco over the summer after being chased by a host of Europe’s top clubs.
Rumours suggest that many were reluctant to commit to the vast sums – £6m for a one-season move – needed to get the hit-man thanks to his long-standing ACL problem – which forced him to miss the World Cup.
United are understood to have put Falcao through a stringent medical, but rumours suggest that he has to apply ice to the troublesome joint after every game and training session.
This is even more of a concern given that he’s managed just three starts for Louis van Gaal’s side since relocating to Old Trafford, netting one goal in the process.
United are set to assess the South American over the course of the next two months, with a clause in his loan deal enough to allow United to commit to a full transfer – which will be worth around £52m.