The Roar go into the Week 12 midweek fixture in solid form having not lost in seven matches but they meet a Phoenix outfit who have not been beaten at Westpac Stadium the last 24 times they have stepped out onto the pitch.
Add to that playing in a different time zone and in poorer conditions to what they are used and Postecoglou says it will be a test for his side although he is confident they can come through with the goods.
"Everyone has recovered well and we've had a couple of sessions over here and they are all fine," said Postecoglou.
"There are some challenges with different time zones and different weather but the players have been very professional.
"We have been pretty consistent in saying that it's about our performances. If we keep playing good football and we keep playing well, the rest should take care of itself."
The Roar take on the Phoenix at Westpac Stadium tonight - kick-off is 7.30pm local time (5.30pm AEDT).