The All Black international ruptured his right anterior cruciate ligament during the Guinness Premiership match with Newcastle Falcons at Kingston Park, which finished 16-16.

"He's out for the rest of the season, so it's a big blow for Sam and for us," Warriors coach Mike Ruddock said.

"What's amazing is that he did it quite early on in the Newcastle game and was able to play on and that just shows what a great character and competitor he is.

"We're going to miss those traits."

Tuitupou, who has scored 12 tries in 35 appearances for the Warriors, will require reconstructive surgery.

The 26-year-old is expected to make a full recovery and be available for pre-season training next year.