Croker played his junior rugby league for the Crookwell Green Devils and Goulburn Stockmen, before being signed by the Canberra Raiders.

[10] In round 1 of the 2018 NRL season, he made his debut for Manly-Warringah, playing at five-eighth 19-18 loss to the Newcastle Knights at Hunter Stadium.

Croker made his long awaited return to the Manly side for their round 7 match against the Canberra Raiders.

[13] Croker played 26 games for Manly in the 2021 NRL season including the club's preliminary final loss against South Sydney after he made a full time move from the halves to hooker.

[14] In round 15 of the 2022 NRL season, Croker scored two tries for Manly and kicked a 40/20 in the clubs loss against North Queensland.