Adamson had previously played underage representative football for Western Australia, being named in the under-15 All-Australian team, before deciding to pursue a career in baseball.
He was signed to West Coast's rookie list under the three-year non-registered rule, which allows clubs to recruit players who have not been registered with an AFL-affiliated competition for more than three years.
Adamson began the 2015 season in the WAFL reserves, playing for West Coast's affiliate, East Perth.
[1] Adamson was delisted at the end of the 2016 AFL season without ever breaking through into West Coast's senior line-up.
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