The 23-year-old hooker turned down down reported interest from other national rugby club to remain in Auckland until the end of the 2021 season.
Named the NRL's best interchange player last year, Tevaga has thrived in a starting role and is averaging 125 metres in his four starts while his 61 tackles in last week's draw with Brisbane was 18 more than anyone else.
Possibly the smallest middle forward in the NRL, coach Stephen Kearney lauded Tevaga for his courage.
"He isn't the biggest forward going around by a long way but that doesn't bother him," Kearney said.
"What he offers is intensity and enthusiasm either starting or coming off the bench."
Tevaga will make his 50th Warriors appearance in Friday's match against Cronulla in Wellington.