Adelaide is set to take on Port Adelaide this Saturday in a prime-time Showdown battle.

The AFL announced on Monday that the Round 21 Showdown would be played at Adelaide Oval on Saturday, August 7.

The game will commence at 7.10pm ACST (7.40pm AEST).

Ticketing details will be communicated to Members and fans in coming days, with crowd capacity to be determined by the SA Government.

The game will be broadcast live on Channel 7 in Adelaide and nationally on Fox Footy.