The players have recommitted to the national body, the Crusaders and Blues as well as their respective provinces.
Barrett, who has played 16 Tests, has signed through to 2020 with 35-Test veteran Crotty recommitting for one more year and Tuungafasi, who has played 14 times for the All Blacks, has committed for three more years.
29-year-old Crotty said in the end it was an easy decision to sign on for another season.
“I took the time to consider my options, and it was clear to me that I still want to be playing my rugby here in New Zealand,” he told the All Blacks’ official website.
“2019 will be my 11th season with the Crusaders, but I still feel as passionate and enthusiastic as I did when my career began. I’m thoroughly enjoying my time in this team and love turning up to work every day alongside great mates, so whether I am representing the All Blacks, Crusaders or Canterbury, I still have plenty of desire to play my best rugby for each of them and I look forward to being a part of these teams for the remainder of this season and in 2019.”
24-year-old Barrett said the opportunity to continue his playing career in Christchurch through to 2020 was too good to pass up.
“I’m loving my time in the Crusaders environment, it’s a healthy training environment to be a part of, with a passionate and motivated coaching group,” he explained.
“The All Blacks and Crusaders teams are obviously hugely important to me and I am driven to perform at the highest level for both of them. For me personally, it’s also special to re-commit to Taranaki Rugby and connect with my home province and the place where my rugby dream started. I want to continue to improve my game and contribute as best I can to rugby in New Zealand.”
26-year-old Tuungafasi, who made his Super Rugby debut in 2013 and All Blacks Test debut in 2016, said he had no hesitation in remaining with New Zealand Rugby and with his Blues club.
“My family and I are Aucklanders. We are proud to be part of the Blues and I’m so pleased to re-sign for the Blues for another three years,” he said.
“There’s no other club I want to be at. I want to achieve 100 games for the Blues and join that special group, and I want to be a big part of a Blues team that wins a Super Championship.
“I’ve been honoured to wear the All Black jersey and represent my country and that’s something I cherish and want to have the opportunity to do in the coming years.”
All Blacks Head Coach Steve Hansen is delighted that the three players have penned new deals with New Zealand Rugby.
“Scotty has come on leaps and bounds in recent seasons,” he said.
“He’s a superb athlete for a relatively young player and has been working really hard to develop the skillset and size to compete at the highest level. We look forward to watching him grow even more over the next few seasons.
“We also welcome Crotts’ re-signing. He’s an outstanding footballer, is a key member in our backline and provides a cool, calm head, especially in high-pressure situations.”
“It’s fantastic news for the All Blacks and the Blues that Ofa has re-signed.
“He has worked incredibly hard on his game over the last couple of years alongside Cronno (All Blacks forwards coach Mike Cron), has absorbed all the learnings and is always looking to improve. He brings a real physicality to his role, is a real team man – and is a big man with a big heart.”