The former Fulham No1 made his Champions League debut in victory over Steaua Bucharest.
"Petr will definitely play at the weekend, for sure," said the Aussie. "As far as I'm concerned he's No 1, he's a world-class goalkeeper and he will go on to bigger and better things. I work with him every day and he's a top guy.
"Throughout the course of a season you're going to make mistakes, without a doubt, and he works very hard and he's very consistent and he does all the right things."
For breaking stories and all the great banter like us on Facebook: facebook.com/tribalfootball