Postecoglou admits they had to change their approach after losing Harry Kane at the start of last season.
He said, "That’s the aim! Don’t get me wrong, if Harry was here I’d be a very, very happy manager. We’d find a way to fit him in.
“But you are right — part of him leaving is that opportunity for people to grow. And we’re still in that phase. There’s more that the guys have in them. I keep saying that some of them have a really high ceiling.
“Some of them are still trying to stick their head up a little bit more every time. Then you have a performance like Palace and you feel like ‘Nah, they are going to cower again and not stand up even further'.
“But you need to go through those experiences. I can definitely see that growth. Once I can cajole and convince them to just keep going, don’t be afraid, don’t fear failure and stumble, criticism and scrutiny.
“There is that opportunity for us and it’s the only way we’ll become the team we want to be. We won’t do that by bringing in another Harry. Those players are rare. For us it’s going to have to be a collective effort to get to where we want to.”