The pair - on loan from NSWL outfit Portland Thorns FC - signed up for another season after playing a key part in Roar's third W-League Premiership title in 2017/18.

“It’s wonderful to have our Portland Thorns duo back with us for season 2018/19," coach Mel Andreatta said.

"Celeste and Hayley are highly respected and key members of our talented squad."

Boureille, 24, is a huge addition to the side after taking out the BRFC Women’s Player of the Season last campaign and impressing for Portland in 2018.

Queenslander Hayley Raso, also 24, will return for a third season in orange.

“After an outstanding NWSL campaign, Celeste goes from strength to strength and will be our midfield general in season 11,” Andreatta added.

“(AND) we’re pleased to have Hayley back in Orange. She is an exciting footballer who I’m sure our fans can’t wait to see out on the park terrorising opposition backlines."

Boureille and Raso join a number of NWSL players to put pen to paper for Roar's 2018/19 season, including Japanese World Cup winner Yuki Nagasato and Orlando Pride's Carson Pickett and Chioma Ubogagu.