The former Celtic striker has been comparing the managers.
Chris Sutton has questioned how passive Ronny Deila was on the touchline against Molde on Thursday night, according to his regular column in the Daily Record.
Indeed, Celtic crashed to a 2-1 defeat to the Norwegian side at Parkhead, with Deila coming under fire for his side's poor performances in the Europa League.
And Sutton believes animated former Bhoys boss Martin O'Neill would never have stood there as idly as the current manager did.
Sutton told the Record: "I used to think Martin O’Neill overdid it a tad. You’d look over at the dugout and see him hopping around like a man possessed.
"But I took a glance down towards the Celtic Park touchline on Thursday night with about 15 minutes to go and what I saw had the alarm bells ringing. There was nothing.
"Ronny Deila’s side were being out-fought, out-thought and out-played. They’d gone down to 10 men. They were 2-1 down in a must-win game and yet I saw no passion, no energy, no organisation and no leadership."
Deila has now got to a stage where every one of his actions will be scrutinised - both by his critics and supporters evaluating whether they are still fully backing him or not.
In front of the press, the Norwegian has remained calm and strong for the most part. On occasion, though, he has lost his rag and hit out unnecessarily against critics who are simply pointing out obvious flaws in his Celtic side.
Even more important is his demeanour on the touchline, however, and, as Sutton says, the Bhoys boss is far from the most animated character in the dugout.
That needs to change if he is to influence Celtic's biggest games. The role of the manager is to make a difference. It's the fans who pay to sit there and watch.