In 2019, the ACT Super Rugby team, the Brumbies, added James Slipper to their team. He was a very positive addition to a successful season, with the Brumbies finishing on the top of the Australian conference. Slipper was said to add wisdom and depth to the team.[citation needed]
On 12 June 2010, Slipper made his debut for the Australia national rugby union team against England at Perth. He is the 843rd player in history to represent Australia. He quickly became a regular for the national team, playing in all six of Australia's matches in the 2010 Tri Nations Series. Slipper featured in 13 of the Wallabies 14 Tests during 2010.[citation needed]
Slipper was chosen in Australia's 30-man squad for the 2011 Rugby World Cup. He played in all of Australia's games during the tournament.[citation needed]
Slipper won his 100th cap for the Wallabies in a 24–22 victory over the All Blacks at Suncorp Stadium in Brisbane.[citation needed]
He won his 140th cap for the Wallabies in a 28–31 defeat to New Zealand on September 21st, 2024 at Accor Stadium in Sydney, overtaking George Gregan as the Wallabies' most capped player. Slipper called time on his international career after his 150th cap against New Zealand in the final round of the 2025 Rugby Championship.
