The Group B match is scheduled to take place in Australia at the nib Stadium on September 3.
In the Asian Football Confederation qualifiers, Australia are grouped with Bangladesh, Jordan, Tajikstan and Kyrgyzstan.
Postecoglou is taking no chances against the 164th ranked Bangladesh and will use a strong line-up for September's match.
"These games will be to put our strongest team out there and make sure we win and we play well and keep progressing our football," Postecoglou told The Western Australian.
"We'll get opportunities to keep broadening our base, but we won't experiment too much in these games. We'll use our friendly games for that.
"We won't compromise on making sure we put our best team out every time we play in these games. Regardless of the opposition, they're World Cup games and to be honest I'm sure the players won't want to miss out.
"We're creating some real competition in the team now. To play a game at home, I don't think there'll be too many who wouldn't want to be a part of that," he added.