Milera debuted in round 1,
2016, against at Etihad Stadium. After playing in the opening four rounds of his debut season Milera suffered an injury and missed the next three rounds. He returned in round eight against and then in round nine against , Milera kicked three goals. After the round 10, 2017, match against , in which Milera recorded sixteen disposals, four tackles and three goals, he was the round nominee for the
AFL Rising Star. Despite playing in 24 games across his first two seasons, Milera did not feature in any of his club's five finals matches. In the 2018 season, Milera was moved to the half-back line as a replacement for the injured
Brodie Smith in Adelaide's round 6 victory over . Milera collected a career-high 33 disposals. In February of 2020 Milera signed a five-year contract extension, keeping him at the club until at least the end of 2025. His
2020 season was cut short by a foot injury which required surgery. Milera went on to miss the
2021 season as well as he suffered a knee injury in the
patella tendon during a pre-season match.
2023 was Milera's most consistent year yet when he averaged a career-high 19.7 disposals as the Crows narrowly missed out on finals. Just a week away of his 100-game milestone, he was forced to watch the remainder of the season from the sidelines, only returning to training at the end of the year. A healthy Milera returned to his best form in
2025, averaging 18 disposals and helping the Crows to a second
minor premiership since his arrival at the club. He finally played in his first finals matches, against and . With more than 10 years and 100 senior matches of service, Milera was awarded with a Life Membership at the Adelaide Crows prior to the
2026 season. He began 2026 strongly, earning ten coaches' votes in the win over the Magpies, and launching himself into early
All-Australian contention with his consistency. ==Personal life==