As the SPL champions trailed the Dons 3-1 in front of a disgruntled home support at Parkhead, it certainly appeared as though they were heading to their third league defeat in a row in the league which is pretty rare for the club.
It also looked as though the players might have been suffering from a Champions League hangover. After the high of doing so well on the biggest stage it can be a bit of a comedown not having that to look forward to any more.
But you've got to give great credit to Neil Lennon and his players because they came storming back in dramatic fashion, scoring three goals and snatching the winning goal in injury time.
It has allowed the vast majority to head off to represent their respective international teams on a high, it has allowed Neil and his coaching staff to have a short break and it will have given all the supporters a big boost as well.
With seven league matches remaining and the possibility of a further two Scottish Cup games if they were to reach the final, Celtic have up to nine games left this season and I'd imagine they'll have their sights set on winning every one.
It would be great if they really signed off in style this term by going on a good run. The championship, of course, was secured long ago and when you find yourself so far out in front without the pressure of a team challenging you it can mean players lose their edge.
However, the danger with that comes when you have a one-off cup game and all of a sudden the players need to try and find their best form again so that's why they really need to focus on performing well in every single game now.
If they do, I see no reason why they can't win the Scottish Cup as well. Yes, Celtic's recent record at the National Stadium isn't as good as Neil would like, and maybe it is a case of playing a certain way at Hampden where the pitch certainly makes for a much slower game than other grounds.
But if they were to overcome Dundee United in the semi- final, it would mean they would face either Hibs or Falkirk in the final.
Over the piece, I think this has been an excellent campaign for the Parkhead club. First and foremost, they have gone about their business in the league efficiently as they moved well clear at the top of the table. Yes, it was expected but they still managed it.
The biggest bonus has been the outstanding European run. To qualify for the Champions League was a truly massive achievement.
It has been without doubt the highlight and achievement of the season and has quite rightly earned Neil a lot of plaudits.
The way Celtic performed in the Champions League didn't go unnoticed.
But they need to finish on a high. If they do then everyone can look back on a difficult season for many reasons and say the club came through it all with flying colours.
Maybe the win over Aberdeen might just provide the final push to get there.