[16][17][18] After recurring injuries to his left middle-finger, Crichton underwent surgery to amputate the top half of the digit in the preseason.

[19] On 28 May 2018, Crichton was named to make his debut for New South Wales off the interchange bench in Game 1 of the 2018 State of Origin series at Melbourne Cricket Ground.

On 22 February, Crichton played for the Sydney Roosters in their 2020 World Club Challenge victory defeating St Helens 20-12.

[citation needed] During the Sydney Roosters shock defeat to Brisbane in round 11 of the 2021 NRL season, Crichton was placed on report for a high tackle.

[27] Crichton played a total of 20 games for the Sydney Roosters in the 2021 NRL season including the club's two finals matches.

During the second half of the match, Crichton was sent to the sin bin after hitting Samoa's Chanel Harris-Tavita with a raised forearm which left the player knocked out.

When Crichton returned to the field, he dropped the ball over the line which cost his team a try scoring opportunity, however Australia would hold on to win the game 30-10.

Crichton's father released a statement which said “I can confirm today that Angus is under appropriate professional support and treatment for medically diagnosed bipolar disorder which he has been dealing with for sometime, He is full supported by his family, his management and the Sydney Roosters club as he works towards recovery, while no timeline has been set for his return to Rugby League, we will continue to trust his medical team and know those with the Rugby League community will respect his right to privacy during this time".

[34] Crichton played 13 matches for the Sydney Roosters in the 2023 NRL season as the club finished 7th on the table and qualified for the finals.

[43] *denotes season competing Source:[44] In 2022, Crichton opened up a barbershop in Bondi Beach with business partner Florian Lagrange.