[2] He played his junior rugby league for the Wyong Roos[citation needed], before being signed by the Wests Tigers.

[8] With Robbie Farah absent for State of Origin, and Manaia Cherrington and Matt Ballin injured, Wests Tigers were given a dispensation for Liddle to make his debut in round 18 against the Canterbury-Bankstown Bulldogs, despite exceeding the 2nd tier salary cap.

[10][11] Coach Jason Taylor said, "For salary cap reasons he probably won't play any more part.

"[9] With Farah leaving the club, Liddle was a regular in first grade, mostly playing from the bench and interchanging with Matt McIlwrick at hooker.

After missing the beginning of the season with rehabilitation, he played 10 games off the bench mid-season before returning to reserve grade.

[18][19] He was ruled out for the remainder of the season with a torn anterior cruciate ligament,[20] saying, "I’ll come back bigger and stronger.

[25] Trainer Robbie Farah said, "He started the year well, but he tapered off a bit so it was probably a kick in the guts to be dropped, but the way he’s reacted has been great to see.

"[26] Liddle played a total of 11 games for Wests Tigers in the 2022 NRL season as the club finished bottom of the table for the first time.

[27] On September 14, Liddle was released from the final year of his contract with Wests to take up a deal with St. George Illawarra for the 2023 season.

After a loss in round 9 against Canterbury, St. George Illawarra head coach Anthony Griffin demoted Liddle from the side.

[30] Liddle played 22 games for St. George Illawarra in the 2024 NRL season as the club finished 11th on the table.