Scott Brown accused his own team of playing schoolboy football after his Fleetwood Town side got sucked into a relegation battle.
The former Celtic hero watched his side lose a last gasp goal to lose at home to Burton Albion and they are now just three points ahead of the drop zone.
And Brown was furious at his players after the 3-2 defeat, where his ten men equalised four minutes into injury time, only to lose another goal almost immediately.
He said: "That was schoolboy, that was Sunday League football. People think that can do what they want here and that’s not happening. That won’t happen again.
"I just can’t get my head around it. For us going forward if we think that’s acceptable, we’ve got a long way to go.
It’s about taking responsibility and that’s on the field, that’s being organised, becoming a team, being responsible, being in shape, being disciplined and understanding the game.
“It's down to players taking responsibility in the park; you can talk about tactics as much as you want but that becomes defend your box, leadership and understanding the time of the game.
"We’ve scored to get it back to 2-2 and you’ve just scored a goal, it’s a time that teams are going to come for you. They’ve got 11 men, we’ve got 10 and we’ve got three attacking players that just go and do what they want.
“That’s when we have to have game management. Game management comes throughout the whole team, understanding the situation that you’re in and understanding the timing of it. See it out, you’d take the one point here.”
Our Celtic Digest newsletter brings exclusive content directly to you rather than solely through the website. You can already find us on YouTube, Twitter, Facebook, TikTok and Instagram but we will also send bespoke opinion pieces and special features directly to your email inbox every evening. Not only will you receive this article from Sean Martin, Tony Haggerty or Aidan Macdonald (or, sometimes, from all three) but you will also get easy access to our best content from the last 24 hours too. It’s a great way to keep up to date with what’s happening at Ange Postecoglou’s Scottish champions. To sign up, simply take five seconds to type in your email here. Simple!