[4] On 1 April 2015, it was announced Piutau would join Irish club Ulster from the start of the 2016–17 season.

He scored a try in the 80th minute against Exeter Chiefs in the European Rugby Champions Cup quarter-final to help Wasps reach the semi-final.

In August 2017, Ulster confirmed that Piutau would be leaving the province at the end of the 2017–18 Pro14 season to join Bristol Bears.

He was not selected for the 2015 World Cup, a factor in his decision to move to play club rugby in Europe.

[9] Piutau has invested in multiple houses in Auckland New Zealand, Singapore, Australia and the United Kingdom.