Over 40,000 fans are expected to filter through the turnstiles at Allianz Stadium on Saturday night after the Sky Blues announced their Round 15 blockbuster against cross-town rivals the Wanderers is officially sold-out. 

Sydney FC's ticket sales information reveals that around 1800 fans from outside of NSW have bought tickets to the clash, with fans from Victoria, Queensland, South Australia, Western Australia, Northern Territory, Tasmania and ACT set to fly in for the game.

These fans are reputedly not even members of the club or the SCG Trust, with the state of Victoria making up the bulk of this number.

It's just another sign of the growing power of the derby - and the Hyundai A-League - as a sports brand.

Large numbers of interstate supporters also represent a win for the economy of NSW with these visitors set to spend their money in and around the stadium on derby day weekend. 

And of course the game is a huge ratings winner for Hyundai A-League broadcaster Fox Sports, up around 30% overall on ratings this season. 

Crowds for the last five Sydney Derby clashes at Allianz Stadium

Sydney FC vs Western Sydney Wanderers – 40,388 - Saturday 26 October, 2013

Sydney FC vs Western Sydney Wanderers – 40,285 - Saturday 8 March, 2014

Sydney FC vs Western Sydney Wanderers – 41,213 - Saturday 18 October, 2014 – Stadium record

Sydney FC vs Western Sydney Wanderers – 40,539 - Saturday 24 October, 2015

Sydney FC vs Western Sydney Wanderers – 40,382 - Saturday 20 February, 2016