"Bluey is a true rugby league man who always has the game interests at heart," he said. "Our families and our association go a long way back. It'll be good to work with him again."
Iro was being groomed for the top job under Cleary but he remains comfortable that his time will come.
"I'm not in any hurry. I had two years left with Ivan anyway expecting to be an assistant. I know I've got plenty to learn and I'm certainly looking forward to learning some more off Bluey," Iro said.
With the club performing well under Cleary for the majority of his six seasons in charge, McClennan has opted for a don't try to fix what isn't broken philosophy.
"All three [coaches] are doing an excellent job in their current roles and by keeping it the same it gives everyone consistency throughout the club in critical areas. I'm really, really pleased," he said.
The highly rated Walker's retention is a minor coup for McClennan, with early reports suggesting he was a near certainty to join Cleary and Phil Gould's Penrith revolution.
"I didn't know much about him but I have spoken to a lot of people about him and everyone has had really good things to say," he said.
