Sydney officials were left red-faced after discovering the AFL club already reached the milestone last year of having one million fans attend their matches at ANZ Stadium.

The club's website listed details of a competition where one lucky person could win thousands of dollars worth of prizes on Saturday night by simply walking through the gates for the West Coast clash as the one millionth fan.

According to Sydney's figures, a total of 964,540 fans had poured through the gates in 21 previous Swans games at the stadium.

However, a list of attendances submitted by the AFL to AAP on request gives an overall figure of 1,025,106 over 21 matches.

After receiving the official AFL figures by email from AAP, Swans spokesman Stephen Brassel admitted the club had made a "stuff-up".

"We're still red-faced. (But) the competition is still going to go ahead," Brassel told AAP.

"Our banner is still celebrating one million fans going to our games at ANZ Stadium."

In a statement issued by the club via the AFL, the Swans said:

"On Saturday night the Sydney Swans will celebrate the fact that more than one million AFL patrons have gone through the gates at ANZ Stadium ...

"The prize will include the opportunity to toss the coin for the big clash between the Swans and West Coast Eagles. The lucky winners will then sit with friends in a fully catered box, where they will be presented with an Australia Post retail voucher worth $2000. They will also win a Sydney Swans signed guernsey and a change room visit following the game.

"The 21 games contested by the Swans at ANZ Stadium so far have seen 1,025,106 patrons through the turnstiles at an average of 48,814 per game with the one millionth attendee ticking over at the last ANZ Stadium game against St Kilda in round 19, 2007. The Swans have played 18 regular season games and three finals at ANZ Stadium."

Brassel said the Swans would also look at subtracting those three finals figures from the overall record and come up with a new competition for later this year.

"Someone sent us an email saying if we had played a final at the end of 2007 at ANZ Stadium we would have broken the one-million mark," Brassel said.

"I don't know how that figure was arrived at. We should have checked it.

"I am actually glad you told us. It would have been worse if we had gone all the way through the week and not found out we were wrong."

Sydney also host Essendon (May 18), Collingwood (July 5) and Geelong (August 16) at the Olympic Games venue this year.

The figure of 1,025,106 includes 172,674 at three finals, which means the Swans have drawn crowds of 852,432 at home-and-away clashes at the ground, 147,568 shy of one million.

"We will now more than likely have our one millionth fan to a home-and-away game at ANZ Stadium when we play Collingwood or Geelong, so we'll do it later on this year," Brassel said.

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