Vatuvei made his debut for the Salford Red Devils in the 27-14 semifinal defeat at Wigan on Sunday (Monday NZ Time).
Salford - playing their first semifinal for 19 years - were stung by two early Wigan tries as the Warriors raced out to a 12-0 lead.
But Salford, who finished fourth in the Super League minor premiership, surged back with tries to Greg Johnson and Tyrone McCarthy and three goals to Michael Dobson to lead 14-12 at halftime.
