Collins,Dodd and Trainor have been appointed following player misgivings about Redman and Carrel's links to staff at Hockey Australia,including chief executive Matt Favier,sources close to the playing group said.
The Australian Sports Commission has also expanded the scope of the review to include both cultural and governance issues,a spokesman said.
Work that had already been done by the original review leaders is being shared with the new panel.
The review was initially announced on December 10 after a tumultuous period in the Hockeyroos camp,which included the resignation of the team's captains and the dropping of key players.
That came days afterThe Age andSydney Morning Herald revealed Hockeyroos players and staff hadraised concerns about a "destructive" culture within the camp and a lack of confidence in non-playing leadership as early as 2017.
Sport Integrity Australia has also set up an independent and confidential process for athletes and others to lodge formal complaints about Hockeyroos culture,bullying and governance problems. Along with the additions of Collins,Dodd and Trainor,these were implemented as extra steps in ensuring an independent process.
"It has always been Hockey Australia's intention that this review be robust,transparent and independent,"Hockey Australia president Melanie Woosnam said.