Luke Thomas is flying home early from Derby County's training camp in Tenerife after being given permission to speak to West Ham United over a potential move to the Premier League club.
The 19-year-old is returning to England on Wednesday evening, three days before the rest of newly-appointed boss Frank Lampard's squad.
Thomas was the Rams' young player of the year last season, making two substitute appearances in the Championship, against QPR and Bolton Wanderers.
His first team debut netted former club Cheltenham Town £25,000 as part of the deal that saw him move to Pride Park in January 2016.
He had impressed for the Robins' youth and reserve teams, making his senior debut in an FA Trophy tie against Chelmsford City at Whaddon Road just before departing Derby.