Goals either side of half-time for Man United saw the Reds win a second consecutive game in the U18 Premier League.
New signings Arnau Puigmal and Largie Ramazani are named.
The young Reds were beaten in the 3rd-place play-off by Club Brugge.
Gomes became the Premier League's first 2000-born player.
#under23s: Twelve academy players in Man Utd first team vs Palace