He previously played for Petone and for the under-20 Wellington side in New Zealand.[4]
When not playing for Glasgow Warriors, Grigg plays for Stirling County.[5]
Grigg has been drafted to Stirling County in the Scottish Premiership for the 2017–18 season.[6]
Professional career
He was part of the Hurricanes Development XV in New Zealand.[7]
Grigg trialled with the Warriors in March 2015 before signing for Glasgow Warriors and securing a place at the Scottish Rugby Academy for Glasgow District[8] as a Stage 3 player. Membership of the academy is restricted to Scottish-Qualified players. Stage 3 players are aligned to a professional club and given regional support.[9]
He has played for Glasgow Warriors in their pre-season match against Clermont.[10] The Warriors lost the match 28–10.
He graduated from the Scottish Rugby Academy and signed a professional contract with Glasgow Warriors on 23 March 2016.[14]
He was named in the Pro14 dream team for the 2017–18 season.[15]
He made 95 appearances for the Warriors, scoring 20 tries for the side.[16]
It was announced in December 2021 that Grigg would join Japanese side Osaka Red Hurricanes in 2022.[3] Grigg said that playing for Glasgow Warriors had much improved his life, although the move from New Zealand had been scary, and praised the players, the people and the culture. He said he was sad to leave Glasgow, but looked forward to the new opportunity for a fresh start. Japan was a new culture to experience, and closer to his home and family than Scotland.[17]
On 6 October 2022, it was announced that Grigg signed an injury replacement contract with French side US Carcassonne to play in the Pro D2, where he joined with fellow ex-Scotland international and ex-Glasgow Warrior Rob Harley.[20] He made his debut for Carcassonne on 7 October 2022 against Massy.[21]
Grigg returned to Hawke's Bay for the 2023 season[22] and scored his first try for the province on 15 September 2023 in a 57–7 win over Manawatu.[23]
He is Scottish-qualified as his grandfather is from Ayrshire in Scotland.[14]
On 25 January 2016, Grigg was named in the Scotland Sevens squad for that year's Wellington Sevens tournament.[25] He made his international debut in the tournament, confirming his Scottish nationality, on 30 January 2016. He played against South Africa, coming off the bench for his debut.
Grigg made his international XV debut for Scotland against Fiji on 24 June 2017.[26]