After his debut season as an extended player, Stirzaker played eleven games for the Rebels throughout 2013, starting twice and coming off the bench on nine occasions.

On 25 June 2013, Stirzaker come off the bench in the 55th minute to play for the Rebels against the British & Irish Lions during their 2013 tour in a 0–35 defeat at AAMI Park, Melbourne.

[5] Stirzaker was subsequently released to Palmerston North-based ITM Cup team Manawatu Rugby Club for the 2013 season.

[8] After a fairly successful 2015 season for Stirzaker – playing fifteen games, scoring three tries, and helped lead the Rebels to a mid-table finish – he was among rumours of a possible call up to the Wallabies squad.

[10] He had undergone off-season shoulder surgery causing him to miss the season-opening match of the 2016 season against the Force in Perth.