 With his father playing for the club, Hendry joined the youth system at Blackburn Rovers.He progressed through the academy, taking a year off from football at the age of 12 following the death of his mother, before being sent out on loan to Clitheroe in 2015.Hendry was offered to the club by Blackburn's academy manager Eric Kinder in order to "test Callum as a footballer in the men's game".