The 30-year-old on Wednesday had her Super Rugby Women's debut green-lit for the Queensland Reds, the utility set to come off the bench against the NSW Waratahs on Sunday.
Caslick had always intended to feature for the Reds this season, but has super-charged her commitment to the traditional code by withdrawing from the remaining two sevens legs in Hong Kong and Singapore and the Los Angeles World Championship.
The touch football convert has been part of the team since 2013, starring in their 2016 Olympic gold medal run and adding multiple world series titles and the 2022 World Cup.
The three-time world sevens player of the year remains one of the best in the business and has ambitions to compete at a fourth Olympics in Los Angeles in 2028.
Tim Walsh's regenerated side, based in Sydney, will learn to live without her in the meantime, with England's World Cup in August-September and Australia's 2029 showpiece now firmly on the radar.
Caslick had a brief club rugby cameo before her sevens debut, but is confident she will be able to handle the physicality of the traditional code while also keeping pace with her sevens colleagues before an inevitable return.
"It's definitely out of my comfort zone; it's new and 12 years of sevens, that was my home away from home," Caslick said.
"I love it (sevens) so much, but I am really excited to do something new.
"It'll keep me fresh and inspired and motivated to improve myself as a player and person.
"The World Cup in England, it's an exciting opportunity to be a part of and would be special in my career to achieve, and then there's the 2029 World Cup.
"If we can set this pathway, get girls playing both sevens and 15s, it puts the Australian side in a good place.
"We saw what the Matildas did in their World Cup in Australia … we can grow the sport and get fans on board."
Fellow Paris Olympians Kahli Henwood (wing), Teagan Levi (centre) and current Australian sevens captain Bella Nasser (bench) will also feature for the Reds, while Maddison Levi remains out with a finger injury.
"Charlotte is a world-class athlete," coach Andrew Fraser said.
"When you add the speed with which she plays and the intellect she has gathered over more than a decade, it's really exciting."She is eager to make an impression. I think the crowd at Ballymore on Sunday is in for a treat just marvelling at what the sevens girls can do."
The Reds beat Fijian Drua in Lautoka last weekend, while the Waratahs, five-time champions, have endured a tight loss and a win against the Drua and Western Force respectively this season.
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