Blues boss Steve Bruce has reportedly already lined-up replacements for the pair with ex-Villa coach John Deehan being linked with a move to St. Andrew's as part of the managers backroom staff.
Eastick had been part of the club's Academy set-up since 1996 and has helped develop youngsters such as Darren Carter, Joey Hutchinson, Craig Fagan, Mat Sadler and Andrew Johnson into first-team players.