Most of the allocated tickets through ticketek were take in blitz on Monday morning, selling out within two hours.
Unused allocations will go on sale from 2pm on Thursday, giving South Australian footy fans one more chance to attend the game.
The 50 per cent crowd capacity will ensure 26,000 fans in full voice as the Power and Dogs do battle for a place in the Grand Final.
The match will begin at 7:10 (ACST), with Port looking to use the home crowd advantage as the Bulldogs aim to continue their run from 5th position on the ladder.
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