LESS than 2000 unreserved seats are available for Port Adelaide's Round 20 Saturday night blockbuster against Sydney at the Adelaide Oval.

It bodes well for another sell-out crowd next week as the ticket sales approach full capacity.

A limited release of reserved seats - on average fewer than 300 tickets - will be made available next Wednesday.

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But all final reserved seat releases have sold out within the first 10 minutes, meaning the unreserved tickets on sale now remain one of the best ways to obtain access to what could be another exciting top five clash, depending on how results fall this weekend.

Port Adelaide's general manager - member services, Matthew Richardson says 3-game membership packages, which remain on sale, are also attractive options to obtain access to the Sydney and Carlton night blockbusters at the Adelaide Oval as well as priority access for finals tickets.

"We have only two home games left in the minor round, but the 3-game packages remain really attractive options for those who want to gain both finals ticket priority and priority access to 2015 season tickets at the Adelaide Oval," said Mr Richardson.

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"The Sydney game is selling just behind the rate we had for the record selling period leading up to our Round 10 game against Hawthorn, so we expect this game to be another sell-out.

"It means those wanting to see the game need to get in quick, because we could be fully sold by next Wednesday afternoon.

"It will mean we're a chance of beating the South Australian AFL record crowd we posted against the Hawks as well.

"With the game day experience we've had throughout the year, our people really won't want to miss this one if they haven't got game access."

Port Adelaide plays Sydney at the Adelaide Oval at 7:10pm on Saturday 9 August.