The Dons were crushed 4-0 at Pittodrie against Neil Lennon’s in-form side, with Odsonne Edouard, Jeremie Frimpong, James Forrest and Mohamed Elyounoussi scoring all four before the half-time break.
We’ve told you previously how Derek McInnes has come under pressure from his own supporters at various points throughout the season, and he talked like a man who knows he’ll be under scrutiny after the full-time whistle.
Speaking to BBC Radio Scotland, McInnes was asked to explain the defeat, and said: “Lack of confidence, lack of personality after we lose the first goal.
“At least up until the first goal we know Celtic are going to find space and have that rotation from back to middle so it was all about making sure we had the answers to deal with that.
“We tried to be aggressive with our pressing in the first 10 minutes but once we go behind there’s a lack of confidence in everything we did.
“It almost felt that every time the ball went into our box in that first half we lost a goal.
“I expect more from my team, I put my team out there and it’s an extension of me (so) I want my team to have far more personality and be far stronger in terms of tackles and making challenges.
“We know Celtic at their best can still beat us and they’ve got good players but by God they knew it today.
“In those forward areas they could do what they wanted without any real contact or challenge, and for me that’s really disappointing.
“We suffered for it, I thought we lost confidence in everything we did after that.
“We spoke at half-time about trying to salvage something from the game in terms of credibility and trying to go and win the second half.
“We were a bit better, we made a few tackles, Bryson – a proper person – came on the pitch and at least you can hear him. He’s talking, he’s organising.
“I think the effect of Celtic’s efforts on Thursday night maybe had a bigger part to play than anything better than we did in the second half if I’m honest.
“I’m deeply embarrassed by the goals we lost and the first half performance. I expect better and everybody should expect better from an Aberdeen team.
“You can’t defend that performance.
“We know Celtic have got to feel our presence, you’ve got to make sure they see a confident player on the pitch.
“The first goal is as poor a goal as we’ve lost.
“Edouard being able to come off 45 yards, receive it from a throw-in and just amble his way to our goal is ridiculous and I expect better.
“I expect a stronger mentality and more aggression to stop that happening.
“We shipped four awful goals. I think the incisiveness and the speed at which Celtic played today unnerved our players, but the only way to combat that is by getting closer and showing no fear.
“We were miles away, miles away.
“That’s two games now against Rangers and Celtic, who clearly have huge advantages and are ahead of the rest of the league, but I still expect us to make a better fist of it.
“I accept there were reasons we lost heavily against Rangers with the lack of experience in the team, but that wasn’t really the case today.
“We were lacking midfielders, clearly, but I still expect better from everybody today.
“An awful day for us at Aberdeen and nobody feels more responsible for that than myself. We all know we’ve got to make sure we give far better of ourselves when we come into these types of challenges.
“I can’t pretend, I can’t just say: ‘we’ll put that to bed and dust ourselves down and move on from it’ because we’ve got to learn from it.
“Players have to realise a lack of talking, a lack of challenges, a lack of determination will normally end up in a defeat regardless of who you play.
“Last week I thought it was a proper Aberdeen performance, one of the ones we’ve been used to over the years, and the challenge was set.
“Thankfully we’ll have a few back for Wednesday (against Hamilton), a few natural midfielders, so hopefully it’ll help to have them back but the proof will be in the pudding.
“What we’ve got to do is to show far more determination to get the desired result.”
Today’s defeat was actually Aberdeen’s first at home all season in the Premiership, but does the nature of the thrashing leave a question mark above McInnes’s head, particularly after the 6-0 loss at Ibrox?
And is it reasonable for the Aberdeen manager to be under pressure at this stage of the season?
Let us know in the comments section below…