A fast and energetic instinctive finisher, Rhys scored an incredible 17 goals in just 21 games for the Under-18s last season.
The highlight was a remarkable purple patch which saw him bag a brace in five consecutive matches.
The former Wimbledon youngster's performances at Under-18 level earned him two substitute appearances for Neil Banfield's Reserves.
Rhys, who was promoted a year at his Brighton school to allow him to balance his schoolwork and training with Arsenal, will be hoping for more second-string chances in the season ahead.Copyright 2017 The Arsenal Football Club plc. Permission to use quotations from this article is granted subject to appropriate credit being given to www.arsenal.com as the source