"He came in as injury cover and he has an opportunity and I'm sure he'll take it with both hands and do well on Saturday night.
Moala, whose only other test appearance came in Apia last year, said he prefers to be playing in the midfield as he goes into the test with a unfamiliar player inside him in Ryan Crotty.
Watch: New All Black Elliot Dixon ahead of his test debut
The two have been training together this week and Moala is confident they'll make be right come Saturday night.
"I was quite surprised when the coaches told me I was playing but I'm, just really grateful for the opportunity and really looking forward to it.
"The last couple of years I've been playing wing and I don't like that as much. I've been playing centre and I feel like that's the position I want to play.
"We haven't had that much time to really connect but the last couple of days Ryan has really been helping me out."
Watch: All Blacks Beauden Barrett and Aaron Smith ahead of the third test