Villa signed highly-rated goalkeeper Matija Sarkic from Anderlecht.
The 18-year-old stopper penned a three-year deal with the claret and blues.
Sarkic was No.1 goalkeeper for Kevin MacDonald's U21 side throughout the 2015/16 campaign and impressed as they reached the Division Two play-off final.
An injury sustained in May's Hong Kong 7s tournament ruled Sarkic out of the club's early U23 Premier League 2 matches.
He came through the youth system at the Belgian club - which oversaw the development of Vincent Kompany and Romelu Lukaku.
Internationally, Sarkic features for Montenegro.