He said he did not expect to sign with a Super Rugby franchise after his first season with the Bay.
"I did not expect to be called into Super Rugby - it is my dream come true. I have a dream job so I can't complain."
Tiatia lives with Chiefs and Bay of Plenty team mates Ziggy Fisiihoi and Mike Kainga in Hamilton, and hopes to get a crack at the wing position for the Chiefs.
"If I keep putting my hand up at training and training hard and doing what I can when I get ball in hand at training, hopefully I will get a shot."
He said Chiefs coach Dave Rennie had made it clear the match today was more of a trial game than a pre-season game.
"I guess this is where you put your hand up and try and earn your spot for the first round, so I will really be itching to get out there and show my stuff," he said. "And it's a nice stadium in Rotorua, so hopefully the fans get out and support the boys."
Tiatia said it had been a tough pre-season, over the summer, and he had been working hard with the Chiefs coaching staff and trainers.
"Coming off my ITM season I was a bit out of condition. The trainers worked me hard before Christmas but now I'm feeling good and ready to go."
Getting to the game:
* What: Gallagher Chiefs v Waratahs (pre-season game).
* Where: Rotorua International Stadium.
* When: Today at 4pm, gates open at 3pm.
* How much: Grandstand $20, adult general admission $10, child (under-15) general admission $5, under-5s free.