Manchester United striker Radamel Falcao has allegedly been told that he can step up his training regime as he nears his comeback from a spell on the sidelines.

The Colombian hitman has been out with a knee injury since October 20, but has been given permission to increase his workload following rehabilitation sessions, Goal.com reports.

Falcao's persistent injury problems have sparked rumours that the forward's proposed permanent move to United is in jeopardy, claims he appears to have rubbished with a recent tweet.

"One fool speculates. A few others lacking objectivity respond and millions believe lies. It is disastrous what a few fools can do," he wrote.

Falcao completed a £6m loan move to Old Trafford from Monaco on transfer deadline day, with a view to making a permanent switch at the end of the season.