"I've watched these guys from afar in England and now I can go and work with them.
"Marc-Antoine Fortune is on the trip with us and I'm looking forward to gelling all our strikers together.
"We are taking this match very seriously. It's about getting a balance.
"We want to protect players but we are always expected to win and we'll be trying to do that."
The clash with Roar is the first of four pre-season friendlies before Celtic's opening UEFA Champions League qualifier.
The new Parkhead boss added: "I'm delighted to be here and I look forward to this game immensely.
"This is my first visit to Australia and it's great to come and meet the fans.
"Celtic supporters are known all over the world and it's fantastic to be in charge of a club with such a worldwide following.
"We are here to show our support to these fans in Australia. We want to give them something back for the support they show us.
"We're looking forward to the event and hopefully we can give them something to shout about."