 After attending King's camp for 10 days, Prust along with Shane Harper were the first to be released from their PTO with Los Angeles on September 25, 2017.On November 29, 2017, Prust signalled the conclusion of his 12-year professional career in joining his former major junior club, the London Knights, as a coach.Although Prust has not formally announced his retirement from professional hockey, his current role as mentor and coach to the London Knights has proven useful over the 2017-18 season and it is reported he will continue in the position.