Slade made his provincial debut for Auckland in 2017 and played 6 games and made the New Zealand Under 20's from that. In 2018 Samuel went on loan to Manawatu[3] and played 8 times for the Province before going back up north in 2019 to Counties Manukau and since then has made 16 appearances for the union.[4]
In 2021 Slade was selected for the Samoan national team to play 2 tests against the Maori All Black's and 2 against Tonga to qualify for the 2023 Rugby World Cup.