Sibosado made his AFL debut in the final round of the 2011 AFL season, replacing Luke McPharlin who was a late withdrawal from the team.[5] Due to an unprecedented run of injuries, Fremantle had to be given special permission to elevate Sibosado and Joel Houghton off their rookie list to enable the team to name a full 25-person squad for the final match of the season.[6] He kicked a goal with his first kick in AFL football.
He was delisted by Fremantle at the conclusion of the 2011 season.[7]