Ronny Deila believes Sunday's high noon meeting with Aberdeen at Parkhead is Celtic's biggest match of 2014/15 so far.
The reigning champions have a three-point lead with a game in hand but the Dons are unbeaten in their last 13 Premiership outings.
Deila said: "In my opinion this is the most important game we have had so far this season - the league is everything. It is going to be hard to reach us if we win.
"The pressure is on both teams but Aberdeen has to win, maybe a draw, to stay in the fight for the championship so this is a very important game.
"They are a very good team, with speed, good on the counter attacks - they have played together for a long time and have consistency. You can see they have built from where they were, so we have to put in a very good performance."
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