[5] Joshua Grommen attended the Queensland Academy of Sport and was part of Brisbane Roar's National Youth League team.
[4] Grommen joined Loyola Meralco of the now-defunct United Football League (UFL) in 2014 but left the club paying out his contract after getting an offer to play for Brisbane Roar.
He later became a free agent but through connections with fellow Filipino-Australian player Iain Ramsay managed to secure a move to Sukhothai of Thai League 1.
Replays showed that Grommen used his hand to score, yet the goal was still counted in the 4–0 win for Ceres, as the referee and his assistants failed to notice the incident.
[11] In August 2020, National Premier Leagues Queensland side Brisbane City announced that they have signed in Grommen.