Former Celtic star Chris Sutton has criticised Brendan Rodgers' demenour during his final few weeks at the club, with the 52-year-old walking away less than 24 hours after a nightmare 2-1 defeat to Hearts left them eight points adrift of their rivals at the top of the Scottish Premiership table.
Celtic have dominated Scottish football in recent years, with both Ange Postecoglou and Rodgers keeping the silverware coming.
But, this season, the Hoops have been a shadow of their usual selves with Hearts mounting a stunning title challenge as a result.
On Monday night, Rodgers decided to quit his position. It came after tensions became strained behind the scenes, with the Northern Irishman also adding to the doom and gloom mood with pointed digs at the club's hierarchy.
Sutton, speaking to the BBC, has now reacted to the bombshell news.
And the former Celtic striker has criticised Rodgers' exploits during his final few weeks in the dugout, admitting that his exit was on the cards the moment he started to step out of line.
"It is astonishing but I think there is a general feeling after Brendan Rogers said his piece before the season, didn’t get the players in which he would have liked, the desired quality," he said.
Brendan Rodgers' second stint at Celtic is now over | GBNEWS/PA"This was rumbling on. In press conferences he had little digs and pokes at the fact he didn’t get players in, and digs that seemed to be aimed at the board.
"His dissatisfaction that he wasn’t given the team he wanted.
"When you go back to last season, and the relative success Celtic had in the Champions League, he felt it was about progressing the club and that hasn’t happened.
LATEST DEVELOPMENTS
Brendan Rodgers took repeated shots at the Celtic hierarchy before his resignation on Monday night
|PA
"They have had a poor start to the season, out of the Champions League and even domestically, not as dominant as they should have been."
Sutton then admitted that Celtic had become an 'unhappy club'.
He continued: "They lost players, didn’t replace them.
Martin O'Neill has returned to Celtic on a temporary basis
| PA"It has been an unhappy club at the start of this season and there has been a friction between Rogers and the club hierarchy.
"Last week, he described his team after the defeat at Dundee, he compared them to a Honda Civic.
"That’s not going to go down well in the dressing room, I think that was another dig at the club.
Martin O'Neill's first spell at Celtic in profile as Hoops icon returns
|PA/GBNEWS
"Watching the club on a daily basis and realising they are miles off it, that’s the way Celtic have been this season, and he has resigned."
Celtic haven't wasted any time in replacing Rodgers.
Martin O'Neill, a club icon, returns to the dugout on an interim basis with former Hoops star Shaun Maloney joining him as they bid to turn things around.
The 73-year-old became a hero during his first stint in charge, guiding Celtic to three Scottish Premiership titles, three Scottish Cups and one Scottish League Cup.
He also made them a force on the European scene, with the Glasgow giants making the final of the UEFA Cup in 2003 - where they lost to Jose Mourinho's Porto.
O'Neill's first game in charge will be Celtic's match with Falkirk on Wednesday (7.45pm).