Manchester United are chasing Benfica fullback Joao Cancelo.

The 20 year-old is impressing this season on-loan with Valencia, where he has shone when called upon by coach Nuno.

Record says Cancelo's progress has alerted United boss Louis van Gaal, who he sees as a successor for Rafael.

Van Gaal plans to sell the Brazilian at the end of the season and has identified Cancelo as a potential replacement.

Valencia have an option to sign Cancelo permanently, but is vulnerable to being outbid over the summer.