Marvin Bartley thinks Celtic's struggles this season could be down to the differences in managerial styles of Brendan Rodgers and Neil Lennon.
The Livingston captain played under the Hoops boss when he was in charge at Hibs and describes him as a motivator but "not a manager who greatly believes in tactics".
This is in stark contrast to the tactical intensity of Rodgers who would relentlessly drill his players in where to move across the pitch.
With a large portion of the squad that was so successful under the now Leicester City boss still at Parkhead, Bartley reckons there could be a conflict in "wavelengths" between those who worked under the former manager and those who haven't.
Asked if he anticipates big changes on and off the pitch for Celtic, the Livingston captain told Go Radio: "Well, I thought there would be a change by now so I'm not sure anymore.
"As Neil Lennon said today, he's quite confident in his job and is quite happy with the way things are going.
"You talked about coaching there and when you do Brendan Rodgers is up there with the best doing it at this moment in time so I think it was very difficult when he left to try and find somebody of the same level.
"And I think you hit the nail on the head with Neil Lennon.
"I've worked underneath him, fantastic motivator but not a manager who greatly believes in tactics whereas I think Brendan was quite the opposite so I think that some of problems that Celtic are facing at the moment, the players who played under Brendan and the boys who have been brought in after are maybe on two different wavelengths.
"If you've gone from a manager that's all about where you should be when the ball is here. All about going to full-back positions and all these other things then you have another manager who is like 'well, you go out there and work out the problems for yourself' and then he motivates you to do that, I think at times it's not as seamless as it had been before. That could be part of the problem that Celtic do have."
While Bartley enjoyed a spell under Lennon he also worked with a man heavily linked to take his job at Celtic, Eddie Howe, at both Bournemouth and Burnley.
The big midfielder is a huge fan of the 43-year-old and rates him as the best coach he's worked under "by a country mile", insisting he'd be a terrific appointment if Celtic decide to change manager.
"You mentioned Eddie Howe, who I have also worked under before, and if they could get him in, for me he's fantastic and who I'd be going for if Celtic are going to make the change.
"It doesn't look like it will happen now, end of the season at best but for me Howe is absolutely fantastic and a great, great choice.
"I have worked under some good managers but coaching wise Eddie Howe was the best by a country mile."
