Fusitu'a is now set to become the eighth Warriors player to clock up a decade of service.
The 23-year-old wing, who debuted as a teenager in 2014, has scored 47 tries in 75 games for the Warriors.
He is currently fourth on the NRL try scoring lists with 15 tries in 18 matches this season.
Coach Stephen Kearney said it had been a priority to retain the powerfully built player, who has played in the centres and at fullback for the club before settling on the right flank.
