Tevaga, meanwhile, suffered a knee injury in training on Saturday, sidelining him indefinitely, with scans and further assessment needed to establish the full extent of the injury.
The injuries to Ah Mau and Tevaga mean four of the club's middle forwards are now out of action with props Bunty Afoa and Jackson Frei back in Auckland recovering from ACL surgery. Centre Taane Milne has also just had an ACL operation.
The Warriors, who are set to move to Gosford later this week to train at Central Coast Stadium, will restart their season on May 30, with the NRL releasing the draw for the next two rounds of the rescheduled campaign.
The Warriors will play the Dragons at 5.00pm next Saturday, before facing the Panthers at 8.00pm on Friday June 5.
Venues for the matches will be confirmed in the next few days.