United States' Giovanni Reyna instructs his teammates during the international friendly soccer match between Wales and USA at Liberty stadium in Swansea, Wales, Thursday, Nov. 12, 2020.
Reyna and Musah became just the 12th and 13th Americans to make an appearance before turning 18.
Reyna formed one of the Americans’ most mobile and dynamic midfields, combining with 21-year-old Tyler Adams of Leipzig and 22-year-old Weston McKennie of Juventus.
Wales is getting ready for a Euros delayed a year by the coronavirus until next June.
Robert Page coached Wales after Ryan Giggs temporarily withdrew following his arrest at his home in Manchester following a disturbance.