Gibson is retiring from the NBA and taking an assistant coaching role with the Bulls, Shams Charania of ESPN reports.
The journeyman big man and longtime Bull was most recently traded from the Grizzlies to the Pelicans on Tuesday before being cut loose by New Orleans. Gibson, 41, is hanging it up after 17 years in the league and beginning his coaching career with the team that drafted him back in 2009. He averaged 8.3 points and 5.7 rebounds per game covering 1,012 regular-season appearances for eight clubs.