[16] On 2 October 2016, Manu played on the wing in the Roosters 2016 Holden Cup Grand Final against the Penrith Panthers, scoring 2 tries in the comeback 30-28 victory after being down 28-6 at halftime.

Manu was overlooked for the Roosters finals series and played for the Wyong Roos in which they made the 2017 NSW Cup against the Penrith Panthers but lost 20-12 at Leichhardt Oval.

The day after the Grand Final win, Manu was selected in the New Zealand national rugby league team 23-man squad for their one-off test against Australia and their tour of England.

Manu played at centre in the club's 2019 NRL Grand Final victory over the Canberra Raiders at ANZ Stadium.

[27] On 22 February, Manu played for the Sydney Roosters in their 2020 World Club Challenge victory defeating St Helens 20-12.

[30] In the round 24 match against arch-rivals South Sydney, former teammate Latrell Mitchell hit Manu with a high and late shot to the head, resulting in a season-ending depressed cheekbone fracture.

[31] On 29 November 2021 after a speculated move to the New Zealand Warriors, Manu extended his contract to start with the Sydney Roosters until the end of 2024.

Manu played in the clubs elimination finals victory over Cronulla but missed the following weeks match against Melbourne in which the Sydney Rooster lost 17-13.

[37] On 16 April, it was reported that Manu had signed a one-year deal to join Japanese Rugby Union side Toyota Verblitz starting in 2025.

[38] In round 8 of the 2024 NRL season, Manu scored two tries for the Sydney Roosters in their 60-18 victory over St. George Illawarra in the traditional ANZAC Day game.