Mark Keane’s professional Australian rules football career commenced after his athletic abilities first captured the attention of an Australian Football League recruiter in 2017 during a North Cork match. Following a series of impressive performances at the highly competitive 2017 AFL European Combine in Dublin, Keane was offered and subsequently signed a contract with the esteemed Collingwood Football Club, marking his official entry into the professional ranks. He joined Collingwood as a Category B rookie in 2018, dedicating himself to the rigorous demands of elite-level training. Keane made his highly anticipated AFL debut in the 2020 season, playing one game, showcasing glimpses of his defensive prowess.
In the same year, he notably distinguished himself in Gaelic football by scoring a late, game-winning goal for Cork against Kerry in the 2020 Munster Senior Football Championship, a significant contribution that led to a major upset victory. He continued his tenure with Collingwood in 2021, further developing his skills and appearing in four additional matches. In January 2022, Keane made the strategic decision to return to Ireland due to the ongoing Covid-19 pandemic, where he temporarily rejoined Gaelic football with Mitchelstown GAA. Keane quickly integrated into his new team, making his impactful Adelaide debut in Round 20 against rival Port Adelaide.
Cementing his long-term commitment and integral role with the Adelaide Football Club, Mark Keane signed a significant three-year contract extension in September 2024. This agreement secures his tenure with Adelaide until the conclusion of the 2028 season, dispelling earlier rumors of a potential return to previous clubs. This substantial extension underscores his critical importance to Adelaide’s future defensive strategies and highlights his rapid ascent within the competitive landscape of the AFL, positioning him as a cornerstone player for years to come.