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Ange Postecoglou admits he will have to pinch himself when he takes Celtic into their first Champions League game next season.
The former Australia boss made an instant impact at Parkhead after arriving last summer by winning the Premier Sports Cup and wrenching the cinch Premiership title back from Old Firm rivals Rangers.
The Hoops go straight into the September group stages of the Champions League with the draw taking place in August and Postecoglou is certain about how he will feel on matchday one.
He told Sky Sports: "Again, it's brilliant. I remember when I was at the World Cup in Brazil.
"I'm sitting on the touchline and we played against Chile in the first game and I remember thinking, 'what the hell am I doing here? I should be sitting in the stand watching.'
"I felt like someone was going to tap me on the shoulder and say the game is starting, get off the pitch.
"It's going to be the same with the Champions League.
"I know there will be a moment when the whistle goes and I think 'what am I doing here?'
"I've never doubted my ability or my belief that I could perform at that level, but how can you chart that course?
"You can have that dream of winning Wimbledon or the Open and you can do that with performances and working hard - it is not easy mind you, but as a manager you need other people to take a chance on you to make those steps."
Postecoglou believes his instant success at Celtic will make it easier for the club to appoint coaches in the future who may not be household names in Scotland.
"I remember when I was national team coach of Australia, the first Australian who had been put in charge to get us to a World Cup," he said.
"I knew that after five World Cup campaigns with foreign coaches, I knew that if I didn't make it to the World Cup or didn't win the Asian Cup another Australian coach wouldn't get an opportunity for another four or five cycles.
"That manifests itself to over here where you know that absolutely, if I don't have some sort of impact it's very unlikely someone will get a door opened from that side of the world."