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21-year-old, Warrington born Reilly is a product of the Birmingham City Youth system having joined the club in 2000.
Callum rose through the ranks to sign pro terms ahead of the 2012/13 season and went on to make his debut, against Crystal Palace, in December of the same year.
He went on to make over sixty first-team appearances for the Blues and also enjoyed a brief loan spell with Jimmy-Floyd Hasselbaink's Burton Albion towards the end of the 2014/15 Football League season.
Callum was released by the Blues following the end of the season and is currently on the look out for a new club.