All Blacks midfielder Jack Goodhue has recovered from glandular fever and has been named to start alongside Sonny Bill Williams for New Zealand's much anticipated clash against England in London on Sunday.
Coach Steve Hansen said medical staff have given the 23-year-old the green light to return to rugby action.
"He's trained the house down, you got to trust the medical people. They say he's ready to go so he's ready to go," said Hansen.
Goodhue was diagnosed with glandular fever last month, which meant he missed the last Bledisloe Cup Test against the Wallabies.
"It's a bit tough on LB [Anton Lienert-Brown] too, because we think LB's been doing a great job for us off the bench."
The All Blacks have left Lienert-Brown out of the 23 and have opted to name Ryan Crotty on the bench.
"But we have got to find out if someone else can do that job," Hansen explained. "And people will go like, 'Shit, this is a big Test,' [but] that's a good time to find out.
"You've got another guy that scored three tries the other day [Ngani Laumape against Japan] and you had a debutant [Matt Proctor] the other day that played really well."
Hansen said New Zealand Rugby is fortunate to have such a huge pool of talent in the midfield, which gives selectors a chance to test out various combinations.
"So we are just blessed with very good midfielders at the moment and it doesn't matter which one you play.
"You just got to work out why they are good combinations, and what combinations gel really well together, and what we can do with the bench when we have one particular combination."