A fast and dynamic midfielder, Polec was selected by the Brisbane Lions with pick five of the 2010 National Draft. Polec made his AFL debut in 2011, but struggled with a range of injuries over his time at the club and only recorded 16 games in 3 years.
Ahead of the 2014 season Polec moved back home to play with Port Adelaide. While primarily played as a small forward at the Lions, he found his spot in the Port side running through the midfield and wing. After playing all but one game in 2014, Polec was struck down with a foot injury and stuck on the sidelines for most of 2015.
Despite playing 90 games across 6 years at Port Adelaide, Polec sought a move to North Melbourne at the end of the 2018 season for further opportunities. He made his debut for the Kangaroos in Round 1, slotting into the midfield and having arguably his best start to a season at AFL level.