A quartet of Premier League giants are reportedly keeping tabs on Benfica starlet Renato Sanches.

The Daily Express is reporting Manchester United, Liverpool, Arsenal and Manchester City all sent scouts to watch the 18-year-old in action for the Portuguese club on Friday night.

Sanches is considered one of the top young prospects in European football and is understood to have a £62million release clause in his Benfica contract.

Benfica are believed to be willing to accept £47million for Sanches, who is also understood to be on the radar of Real Madrid, Barcelona and Bayern Munich.