The All Blacks open the Rugby Championship against Australia in Sydney on Saturday and the home side will be fired up as they embark on their first test under new coach Ewen McKenzie.
As for whether Coles was ready for the intensity of a Bledisloe Cup encounter, Mealamu sat on the fence.
"Watching him play in the first couple of tests this year, I think he's more than capable of stepping up. But I think at the end of the day it just comes down to what the coaches want to do and how they want to attack this game coming up, so we'll just have to wait and see.''
Coles started the first of the All Blacks' practice matches in Lower Hutt on Friday night when a shadow first-string XV - minus any Chiefs players and the injured Ma'a Nonu and Wyatt Crockett - beat Canterbury 19-0.
Coles, Mealamu and Hore all spent time at hooker in the second 40-minute hit-out against Wellington, although injuries meant Mealamu and Hore also played on the flanks.
As the All Blacks look toward this weekend's test against the Wallabies one of the major talking points will be the new scrum laws, which place greater importance on hooking the ball.
"I thought the changes were quite positive,'' Mealamu said. ``For teams that love to scrum it's a good way forward. Obviously it's going to take a bit of time for us to get a bit better at what we are doing but we see it as a real positive.''
The All Blacks played under the new scrum laws during their practice matches against Canterbury and Wellington with mixed results.
Meanwhile, Canterbury midfielder Ryan Crotty has been called in to the All Blacks squad as injury cover after Francis Saili suffered an ankle strain in Friday's practice matches that will leave him on ice for at least a week.
Second-five Ma'a Nonu has also been limited of late due to an ankle issue but Hansen said he expected the 31-year-old to train fully this week and welcomed Crotty into the mix.
"He's got a skillset that we like and he was the next cab off the rank, so, the obvious choice to bring in,'' Hansen said of Crotty.