Warriors forwards Tohu Harris and Bunty Afoa are set to miss up to six weeks each after being taken off the field in their loss to Cronulla at Mount Smart Stadium over the weekend.
Harris had to limp off in the last minute of the game, and scans revealed a meniscus tear in his left knee.
The second rower will now have surgery to repair his knee, and is hopeful to return in 4-6 weeks.
Afoa only played 12 minutes in the game before dislocating his left elbow and being helped off the field. He is expected to miss six weeks.
Harris has appeared in 14 matches for the Warriors this season, while Afoa has made 15 appearances.