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What we do know is that whatever the line-up is on Sunday they are going to be a formidable opponent.
“One thing we’ll never do is not respect an opponent irrespective of the build-up to a game, particularly a big game.
“What you know is that for both sides, both sets of 11 players, you start that game and you’re up for a big game and you’re concentrating on yourselves.”
Celtic has sealed six wins in the Scottish Premiership to rebound from defeats at Hearts and a Champions League exit.
Postecoglou though was not getting too far ahead of himself.
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Rangers will be looking to strengthen their title defence with a win over their arch rivals on Sunday.
Gerrard’s side claimed a 2-0 victory the last time these two sides met in the Scottish Cup in April with Steven Davis opening the scoring before an own goal from Jonjoe Kenny.
Celtic were unable to beat Rangers at all last season with their most recent Old Firm win dating back to December 2019 when they claimed a 1-0 victory in the Scottish League Cup final.
Both clubs secured their place in the Europa League on Friday morning (AEST) with the Hoops edging out AZ 3-2 on aggregate and Rangers defeating Alashkert 1-0.