Maddinson had been in contention for selection in Australia’s side for the first Test starting Thursday week in Brisbane.
“The wellbeing of our players is always our primary concern,” Cricket Australia’s EGM of national teams Ben Oliver said.
“We are proud that our players are comfortable to speak honestly and openly about how they are feeling.
“We will provide Nic with all the support and care we can and wish him a full and speedy recovery. We also ask that Nic’s privacy be respected at this time.”
Australia A coach Graeme Hick said he supported Maddinson, who had been in contention for a Test recall, for speaking up about his condition.
“Nic has made the right decision and we are all behind him,” Hick said. “It is braver to speak up than to suffer in silence and I applaud Nic for having the courage to put his health first.
“While saddened to see Nic stand down, we welcome Cam Bancroft to the Australia A XI. Cam is obviously no stranger to quality international bowling and the Perth Stadium wicket. We have no doubt he will fit well into the team.”
CA’s head of sports science Alex Kountouris said the governing body was committed to better understanding mental health and its impact on their players.
“Mental health is a challenge faced by Australian communities and elite sporting organisations and cricket is no different,” Kountouris said.
“Like other professional sports we are working very hard to better understand the challenges faced by our players and staff so we can support them.
“We are all proud to work in an industry where players can feel safe to talk about these issues. It goes without saying that we offer all our players the support they need in the difficult times but importantly we are working on education, resourcing and research to better understand how we do this.”
Andrew Wu writes on cricket and AFL for The Sydney Morning Herald