"I think there will be significant change, only because there has been a pretty big turnover in players from last year," Postecoglou told Sky Sports News.
"A lot [of players] have left and we need to bring in some, and whenever that happens I think that is significant change.
"Also we will probably play a little bit differently to what they have played in the past, so whether it is a rebuild or just a shift in direction it will be significant change for sure
"I'm not talking to anyone, we have got multiple targets and there's a lot of names being thrown around.
"From my perspective, it's more about making sure that we do bring in some players who can play the football that I want over the next period and the club are working awfully hard to make that happen."
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