This season's free agency and trade period has officially closed and so it's time to look ahead to the biggest fish who could be on the market in 2020.

A number of stars will enter free agency who didn't make our list, including, Tom Hawkins, Ben Stratton, Robbie Gray, Bachar Houli, Josh P. Kennedy, Josh J. Kennedy, Shannon Hurn and Easton Wood.

However, due to age or just the sheer unlikelihood that they would leave their clubs, we've left them off our list in favour of guys who are either more getable or in their prime.

Here are the top 10 free agents of 2020:

7. Mitch Duncan (unrestricted)

Duncan enters unrestricted free agency as arguably Geelong's most underrated midfielder. He is coming off an ultra consistent campaign, averaging 25.3 disposals and 7.5 marks.

Whether Duncan has any interest in exploring the market is unknown but he is from Western Australian and could have a desire to return home.

The silky onballer continues to play a key role for the Cats in their quest to get back to the promise land and retaining him should be a key priority.

BRISBANE, AUSTRALIA - JULY 08: Mitch Duncan of the Cats runs the ball during the round 16 AFL match between the Brisbane Lions and the Geelong Cats at The Gabba on July 8, 2017 in Brisbane, Australia. (Photo by Chris Hyde/Getty Images)