Obi made seven appearances for the senior team last season, but has not been included in the first team's squad this term.
Travis Bannion, the U21 coach, believes Obi has yet to reach his full potential and is eager to continue learning and growing as a player.
Bannion notes that Obi is driven to succeed in football and is making progress in understanding the game, including how to work effectively with his teammates.
The coaching staff considers Obi a priority, given his age and the importance of this period in his development as a player.