Mitchell won the Brownlow Medal as the league's best and fairest player in 2018 and set the record for the most disposals in a VFL/AFL match, accruing 54 in a game against Collingwood during that season.

[1] Mitchell experienced a number of injuries in 2012 and despite some good form in reserves games, was unable to break into the senior side that won the premiership.

[5] During round 9 of the 2014 season, Mitchell played in the Swans reserves team and had a record 64 disposals (23 contested, 41 uncontested) and kicked four goals.

[9] He was runner-up to Dustin Martin in the 2017 Brownlow Medal (Patrick Dangerfield polled more votes, but was ineligible due to suspension).

On 11 January 2019, It was announced that Mitchell would miss the entire 2019 season after suffering a broken leg during a tackling drill at training.