Reece Oxford made 12 impressive appearances for West Ham last season

Manchester City have made an official approach to West Ham about signing youngster Reece Oxford, Sky sources understand.

However, City have denied to Sky Sports News HQ that that is the case.

Oxford, the 17-year-old central midfielder who shot into the public eye in an impressive display against Arsenal on the opening day of last season, is understood to be valued at £15m by the Hammers.

Sky sources understand that the East London club have already turned down a £10m bid for Oxford from Bundesliga club Red Bull Leipzig, while Newcastle have requested to take him on a season-long loan.

Oxford rejected a new contract at West Ham at the end of last season, with his current deal still carrying him through to 2018.

He made his Hammers debut in the Europa League first qualifying round in July 2015 following Slaven Bilic's arrival as manager, and then became the youngest Premier League player when he started against the Gunners last summer.

He has since played a further 11 games for West Ham but his last may have come as a substitute in the 3-0 win over West Brom at the Hawthorns on April 30.