Spurs go to Klopp's Liverpool on Sunday.
Postecoglou said: "He has had a massive impact. I'll always be drawn to managers who are different, who play differently with a clear identity and a clear vision - Jurgen has that.
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"It is not easy going into a big club like that with lots of success traditionally. To come in and transform the club the way he did, credit to him.
"I'm sure we'll see him back. He is one of top managers in the world. (Liverpool are) such a big club he was able to imprint his own style, vision and bring success."
On yesterday's defeat at Chelsea, he added: "I am sure they are hurt and that is part of the process...Big games are always big. You need to feel the pain and to understand. The intensity is always there when playing for this football club."