ALSO READ: Callum Robinson set for full international debut as three Preston players are named in Republic of Ireland squadThe striker will link up with the young Three Lions for the games against Switzerland and the Netherlands after PNE’s clash with Bolton on Saturday.
England play Switzerland at St George’s Park on Thursday, September 6, before travelling to the Netherlands for a game at KVV Quick Boys, Katwijk on Monday, September 10.
Nmecha has represented his country at Under 16, 17, 18, 19 and 21 level but this would be his first Under 20s appearance.
He becomes the fourth player away on international duty after Saturday with Alan Browne, Callum Robinson and Graham Burke in the Republic of Ireland party.
Chris Maxwell missed out on a spot in Ryan Giggs' Wales squad.