"Player management is really important to ensure the performance and longevity of our athletes aren't compromised as we move into a new high performance cycle ahead of the 2018 Gold Coast Commonwealth Games and 2019 Netball World Cup in Liverpool," Diamonds coach Lisa Alexander said.
"After such a big year on and off the court, the national selectors and I are mindful of our athletes' physical and mental well-being, particularly those who contested the 2015 ANZ Championship grand final and Netball World Cup.
West Coast Fever's Brazill is a step closer to making her long awaited international debut three years after injury forced the 25-year-old to withdraw from the Diamonds team ahead of the 2012 test series.
Melbourne Vixens defender Weston will be reunited with her former Australian 21/U teammates Paige Hadley, Kim Ravaillion and Gretel Tippett, who won silver at the 2013 World Youth Netball Championship in Glasgow.
Renae Ingles, who missed the second test with a calf strain, will assume the role of acting captain for the remainder of the Constellation Cup series subject to passing a fitness test ahead of game three on Sunday.