[3] On 21 September 2016, Nafi sign professional contract with English club Northampton Saints in the Aviva Premiership from the 2016–17 season.
[4] Tuitavake made some good appearances in Saints' second side the Northampton Wanderers, before being drafted into the first team as the wider squad suffered with injuries.
The Tonga centre thrived and secured a place in the first team quickly and most recently helped his side secure European Champions Cup rugby for the 2017/18 season as the side beat Stade Francais by just one point.
[5] Tuitavake will travel with Tonga for their 2017 summer internationals, battling with fellow Pacific Island nations, and Saints teammates, for a Rugby World Cup qualification for the 2019 competition.
He gained selection to the 2019 Rugby World Cup in Japan and made just one appearance, against England, before being sent home with a fractured arm.