 Goulbourne was assigned to the Flyers American Hockey League (AHL) affiliate, the Lehigh Valley Phantoms for the 2015–16 season.He struggled in his first two AHL seasons, only earning 18 points in a combined 97 games, and was reassigned to the Reading Royals in the ECHL.He described the demotion as "hitting rock bottom" and eventually created enough consistency to play back in the AHL the following season.