Manchester United chiefs are impressed by the professionalism of Radamel Falcao.

On-loan from AS Monaco, Falcao has suffered a difficult season on the pitch at United.

But the Daily Star says senior sources inside Old Trafford are said to be impressed by Falcao's work ethic, which they compared to that of goalscoring great Cristiano Ronaldo.

United are claiming that they haven't yet made their mind up to make his loan move permanent.

But it remains highly unlikely the club shells out £43m on a 29-year-old short of form and fitness.