The top try-scorer in the NRL Telstra Premiership last year, Fusitu'a's absence would be significant blow to a Warriors side staring down the barrel of three straight losses for the first time since 2017.
Coach Stephen Kearney said the early indications were that Fusitu'a had suffered rib cartilage damage.
"Given it's a five-day turnaround to our next match I would anticipate he will be unavailable. It didn't look good," Kearney said.
"Looked like possibly rib cartilage, but I'm not 100 per cent sure."