Barcelona may have a final say on any move for Benfica fullback Alejandro Grimaldo.

Manchester United scouts watched the former Barca B defender on the weekend against Feirense, while Manchester City boss Pep Guardiola has made a personal check.

Valencia have also joined the interest as Grimaldo establishes himself as a first-choice for Benfica this season.

However, any future deal will depend on Barca, which have a share in the player's sell on fee.

Grimaldo was sold by Barca to Benfica for a knockdown €1.5 million and it's been confirmed they'll be due a hefty percentage of any future sale.