The SA20 will again significantly overlap with the BBL when it starts in early January, while the ILT20 begins earlier next season so it creates an even greater clash.

In return, under terms of signing a three-year deal, a player must commit to the entire BBL including the finals from the 2025-26 season, but Billings has gone a step further and will also be available throughout next season's edition.

"I love Sydney and in particular Western Sydney and the chance to come back to a family club that is so connected to their members and fans and the people from the area was too good an opportunity to ignore," Billings said.

"On the field we are pulling together a really good squad and the chance to work with such an accomplished coach as Trevor Bayliss again was very appealing.

"The BBL is in such a great place these days, it's well run, well supported and definitely the best tournament in the world staged at that time of the year. That's why I have committed long term and to be here right until the end of the tournament each year."

"The beauty of bringing a player the calibre of Sam Billings to the club is not just the elite skillset he brings to every facet of the game but also his leadership on and off the field," Copeland said.

The WBBL has the same multi-year contract mechanism with New Zealand allrounder Amelia Kerr the first signed under the agreement as she moved to Sydney Sixers from Heat.

Sydney Thunder BBL squad 2024-25: Wes Agar, Cameron Bancroft, Sam Billings, Oliver Davies, Matt Gilkes, Chris Green, Liam Hatcher, Sam Konstas, Nathan McAndrew, William Salzmann, Daniel Sams, Jason Sangha, Tanveer Sangha