The club thanks Elliott for his hard work and professionalism during his 14 months at the Academy and wishes him well for the future.
The club has made a number of changes across the Professional Development Phase of its Academy in recent months.
Graeme Carrick was appointed as Under-18s coach in August and was joined by assistant Chris Moore, with Peter Ramage moving to support Shola Ameobi as Loan Player Coordinator.
Meanwhile, former under-18s assistant coach Ian Bogie returned to his role as Under-15s/16s lead coach, while Under-21s assistant Kevin Richardson left the club in October.
The Academy's Head of Coach Development, Neil Winskill, will oversee Under-21s' training before the club confirms its new Under-21 coaching line-up in due course.