The Blues have added prop Karl Tu'inukuafe on a three-year deal.
The All Blacks front-rower has signed with the Auckland-based franchise and New Zealand Rugby through to 2021.
"It is exciting for my family and me to be coming home. I think we have a strong squad for next year. I have my Harbour coach Tom Coventry coming in to take the forwards and I get to stay in the region," he said.
"The set-up at the Blues looks great and I am going to enjoy being part of this club and hopefully I can do my part in helping the club do well."
The 25-year-old burst onto the Super Rugby 2018 scene with the Chiefs, which saw the loose-head prop fast tracked into the All Blacks this year where he featuered in all three tests against France.
All Blacks coach Steve Hansen said it is fantastic news for New Zealand Rugby.
"Big Karl really impressed us in his first campaign with the All Blacks in June," said Hansen.
"He's a humble man and very low-key, but he went about his work in a very professional manner.
"We all saw how destructive he can be as a scrummager but he's also nailing his other core roles, he's eager to learn and he made great strides in the black jersey. We look forward to working with Karl in the future."
Blues coach Tana Umaga said the front rower has been the find of the year in New Zealand rugby.
"He will be a really strong addition to our pack and gives us real depth in our front row with the likes of Ofa Tu'ungafasi and Alex Hodgman," said Umaga,
"While Karl is comparatively new to the sport at this level, he will provide leadership to our young front rowers emerging in the club."
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