Manchester City have made an official approach for West Ham midfielder Reece Oxford, according to reports.

Sky Sports says the 17-year-old, who is contracted to the Hammers until 2018, will command a transfer fee of around £15m ($20m).

West Ham are reported to have already turned down a £10m bid for the starlet from Bundesliga side Red Bull Salzburg, while Newcastle have also made an approach to sign the player on a season-long loan.

Oxford made seven league appearances for Slaven Bilic's side last season. He has also been linked with a move to City's arch-rivals Manchester United and Tottenham Hotspur.

City scouted the player at this summer's U-19 European Championship and were impressed by what they saw, according to the Independent.

Oxford is open to joining the Etihad outfit as he relishes the chance of working with Pep Guardiola, the paper says.

He became the youngest Premier League player in history last August when he made his Hammers debut against Arsenal.

Reports in May suggested that Oxford rejected a new contract with West Ham, although he denied this via his Twitter account.

Reece Oxford
Reece Oxford, 17, has been linked with Manchester City and UnitedGetty Images

Guardiola and his City squad are in Germany for a pre-season friendly against Bayern Munich on 20 July.

City's chairman Khaldoon Al Mubarak said last month that the Spanish coach would take the club to a "whole new level" next season.

"I am absolutely excited about Pep joining our team, I consider Pep to be one of the best if not the best manager today in football," Al Mubarak was quoted as saying by Sky Sports.

"We are getting a manager that epitomises, in my view, passion and commitment.

"He's a winner, he is a proven winner. He has won professionally in every team he has coached. His record at Bayern Munich and Barcelona I think speaks for itself."

Guardiola won 21 trophies in seven years at Barcelona and Bayern.