After both players started the First Test on the bench, Roger has been named in the back line while Ryan will line up across half back.
Before last Friday night's First Test at Subiaco Oval, only six of the 25-man Australian squad had previously represented their country in a series.
And while Ryan had only played twice before – in 2006 – he has been a source of education for many teammates getting to know the round ball for the first time.
"A few of the guys have come up to me asking me different aspects of the game and the way the different rules are," Ryan said.
"It’s really good and I’ve enjoyed it."
The 24-year-old says he has been impressed with how well those players have adjusted to the hybrid code and expects more improvement before this Friday's deciding Test at the MCG.
"I thought we picked it up really quick," Ryan said.
"All the boys here are skilful guys and we got some balls sent to us a couple of weeks beforehand just to get the feel of them.
"With that couple of weeks you pick it up fairly quickly. Even over the next week you’ll see us get better and better."
Ryan says Australia will look continue its hard running and tackling that was a feature of the narrow defeat in the First Test at Subiaco Oval.
"The tackle count was a lot in our favour and that is the thing that got us back in the game," he said.
"That is one advantage we’ve got so we’ll try to capitalise on that."
The 2008 International Rules Series: Australia v Ireland
Second Test – MCG, Melbourne, Friday October 31
Australia Line Up
Goal keeper
Michael Firrito (North Melbourne)
Backs
Roger Hayden (Fremantle), Nathan Bock (Adelaide), Campbell Brown (Hawthorn)
Half Backs
Ryan Crowley (Fremantle), Drew Petrie (North Melbourne), Adam Selwood (West Coast)
Midfield
Brent Harvey (North Melbourne), Daniel Wells (North Melbourne)
Half forwards
Marc Murphy (Carlton), Jared Brennan (Brisbane Lions), David Rodan (Port Adelaide)
Forwards
Michael Osborne (Hawthorn), Shaun Burgoyne (Port Adelaide), Matt Campbell (North Melbourne)
Interchange
Matthew Boyd (Western Bulldogs), Nathan Foley (Richmond), Josh Hunt (Geelong), Leigh Montagna (St Kilda), Daniel Motlop (Port Adelaide), Scott Pendlebury (Collingwood), Brad Sewell (Hawthorn), Kade Simpson (Carlton), Dale Thomas (Collingwood).
In - Josh Hunt
Out -Scott Thompson (calf)
