Career
He was co-captain of the Brisbane Lions in 2013 and sole captain in 2014. He was recruited as the number 33 draft pick in the 2003 American Federation of Labor-Congress Draft from the North Ballarat Rebels. He made his debut for the Brisbane Lions in Round 7, 2004 against North Melbourne.
In 2007, Adcock came second (behind Jonathan Brown) in the best and fairest and was also an all Australian nominee.
He was in the top 10 in the American Federation of Labor-Congress for free kicks and was in the top 15 for tackles. In 2008, Adcock was appointed as one of four vice captains alongside Simon Black, Luke Power and Daniel Merrett.
Adcock played in the first 15 games of 2009 before getting injured. Scans revealed that the injury was a tibial plateau fracture which kept him off the field for 10–12 weeks.
He returned for the second semi final against the Western Bulldogs, and played in his first ever final.
In 2013, he became co-captain of the Lions with Jonathan Brown and in January 2014, became the sole captain. After 1 season in job, Adcock stepped down to a mentor role and Tom Rockliff took over as captain. In August 2015, he was advised he would not be offered a contract extension for 2016, and was subsequently delisted by Brisbane.
He was, however, drafted by the Western Bulldogs in the 2016 rookie draft with the 46th selection.