Celtic manager Ronny Deila will look for answers for their below-par performance at Kilmarnock after the elation of their late victory subsides.
Saturday looks likely to prove the crucial afternoon in the Scottish Premiership title race. With seconds before the 90 minutes were up, Celtic looked set to hand Aberdeen the chance to go top as they laboured at Rugby Park.
But Tom Rogic unleashed a stunning long-range strike to secure a 1-0 victory for the champions and they ended the day four points clear with a game in hand following Motherwell's second-half comeback against the Dons.
But the fact remains that Rogic's goal was spectacularly out of keeping with Celtic's general play. After a decent start, they struggled to break Kilmarnock down and their two best chances came from Erik Sviatchenko headers following corners.
Deila said: "It was a very important moment but we will get answers from this as well. We need to lift the performance from this one."