"But when you are running with a small squad it's the number of injuries and suspensions that hit you harder.
"You have to factor in the European football and the matches some of the boys will be playing with their national sides in the first part of the season. I can only hope that doesn't take its toll.
"There is no doubt that could inhibit us a bit in terms of any success."
The Rangers manager added: "We just have to do everything we can to make sure everyone stays as fit as possible, but we have to keep a certain level of discipline in our play as well."
Striker Andrius Velicka will also miss the Australian tour as he battles back from a knee injury which has kept him sidelined since last August.
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