Optus Stadium is set to welcome its one millionth fan through the gates when Fremantle take on Adelaide on Sunday.

As a result, Fremantle and Optus Stadium have teamed up to ensure that the one millionth fan will be rewarded with an experience to remember.

The winning fan through the gate will receive a free upgrade for up to four people to the Premiership Terrace for Sunday's game, a Freo Dockers signed jumper and a $50 food and beverage voucher.

The lucky fan will also receive four tickets to an event of their choice at Optus Stadium (valid until 31 December 2018) plus four vouchers worth $55 each for the City View Cafe (located at gate C).

The prize will be presented at the game by Minister for Sport and Recreation Mick Murray.

Bouncedown for the clash is at 2.40pm, so make sure you get there early for your chance to win!