Bridge Pa-born and raised, Greening, represented the Hawke's Bay Ross Shield team and under-14s in union as well as the 13s, 15s and 17s in league.
Last year Greening trialled for the Warriors Under-20s as a 17-year-old and Tamati will take him back to Auckland for another trial this year.
Tamati believes Greening's versatility is his biggest asset in the 13-man code. "We've had him at prop, second row, loosie, centre and fullback.
"Prop is the best spot because you have to muscle up on attack and defence and put everything on the line," Tamati, who played 22 tests for the Kiwis at prop between 1979 and '85, said.
Greening pointed out it would be tough to leave the improving MAC side if he made the Warriors Under-20s.
"But that's my dream that's what we've been building for," Greening said after completing a boxing training session with Tamati at the Choices Gym in Hastings.
A natural leader, Greening, boasts similar skills to another of Bridge Pa's favourite sons, East Coast Heartland Championship player Everard Reid, and he enhanced these skills when attending an International Rugby Academy of New Zealand course last year. When he completes his programme commitments with Tamati, Greening intends to study to become a teacher. It's obvious he could become a mentor to youth in years to come.
However his immediate priority is to help MAC beat Central in their Maddison Trophy first round encounter at Flaxmere's Ron Giorgi Park on Saturday.
"Central won't be easy as we only beat them by two points in the season opener. However we're hopeful of winning our first five games in the Maddison so we've got to start well," he added.
Needless to say an MAC loss to Central could see Greening's dream turn into a nightmare ... temporarily.