He played for the Rabbitohs' NYC team from 2012 to 2014 before moving on to the Rabbitohs' New South Wales Cup team, North Sydney Bears three rounds into 2014. He captained the NYC team in 2013 and 2014. In October 2013, McInnes re-signed with the Rabbitohs on a 2-year contract. At the end of 2013, McInnes won the Rabbitohs' NYC Best and Fairest award, Player's Player award and was named on the interchange bench in the 2013 NYC Team of the Year.
2014
In Round 5 of the 2014 NRL season, McInnes made his NRL debut for the Rabbitohs against the St. George Illawarra Dragons. In Round 11, McInnes scored his first ever NRL try, slicing through defenders 10m out to plant the ball the down.
2015
McInnes was selected twelve times in 2015, playing off the bench, at Hooker and even at times in the back-row. In Round 11, McInnes scored the winning try against the Parramatta Eels, latching onto a pass from fellow hooker, Issac Luke, before diving over the try-line. On 13 May 2015, McInnes re-signed with the Rabbitohs on a 2-year contract.
2016
The departure of Isaac Luke to the New-Zealand Warriors gave McInnes the starting role for the Rabbitohs. In Round One he opened the scoring, diving under the posts five minutes into the Rabbitohs 42-10 win over the Sydney Roosters. In Round 5, McInnes was credited with a 'stellar' performance, creating all three tries for the Rabbitohs. After scoring two solo tries from dummy half, he then put, Cody Walker through a hole to score in the Rabbitohs 12-16 win over the Manly Warringah Sea Eagles. As the season went on McInnes would switch between starting and interchange hooker, as him and South Sydney's alternate hooking option, Damien Cook fought for a starting position. By the end of the 2016 season, McInnes had played 19 games, scoring 4 tries with 1 try assist and an impressive 726 tackles. In September 2016, McInnes signed a 2-year contract with the St. George Illawarra Dragons starting in 2017, after being released from the final year of his Rabbitohs contract following their signing of New South Wales State of Origin representative hooker Robbie Farah.
2017
In December 2017, McInnes signed a 4 year deal to remain at St George until the end of the 2021 season.
2018
In 2018, McInnes was part of the St George side which qualified for the finals and defeated Brisbane 48-18 in week one before being eliminated the following week by South Sydney 13-12.
2019
McInnes made a total of 23 appearances for St George in the 2019 NRL season as the club endured one of their worst seasons finishing in 15th place on the table just above the last placed Gold Coast. Before the season had started, St George were expected to reach the finals and challenge for the premiership but only managed to win 7 games all year.
