There are two additions to the group due on Monday, with Daniel James and Scott McTominay linking up for the first time since their Euro 2020 exploits.
Dan helped Wales qualify for the knock-out stages with a series of high-energy performances, while Scott was particularly impressive in an unfamiliar defensive role for Scotland in the draw with eventual finalists England at Wembley, although a defeat to Croatia ended the nation's hopes of progressing.
With a number of players still unavailable, there will be more opportunities for Academy prospects to catch the coaching staff's eyes.