He attended Warilla High School and played junior football for both the Port Kembla Blacks and Windang Pelicans.

[6] He finished the season as a member of the Sydney Roosters 2010 NRL Grand Final team that lost to his former club, St. George Illawarra, by a score of 32–8.

At the end of the 2013 season, Linnett represented Scotland at the 2013 Rugby League World Cup, qualifying to play for them through his mother.

[8] Later that month, Linnett was a part of the North Queensland club's victorious Auckland Nines team and was subsequently named in the 'Team of the Tournament.

Linnett made 12 appearances for the North Queensland Cowboys in 2018, as the club struggled towards the bottom of the ladder for the entire season but won their final two games to avoid the wooden spoon.

[15] Linnett made a total of 20 appearances for Hull KR in the 2021 Super League season including the club's 28-10 semi-final loss against the Catalans Dragons.

[16][17][18] On 12 August 2023, Linnett played for Hull Kingston Rovers in their 17-16 golden point extra-time loss to Leigh in the Challenge Cup final.

[19] In round 23 of the 2023 Super League season, Linnett scored two tries for Hull Kingston Rovers in their 52-10 victory over Leigh in the Challenge Cup final rematch.

[20] Linnett played 24 games for Hull Kingston Rovers in the 2023 Super League season as the club finished fourth on the table and qualified for the playoffs.