Livingston skipper Marvin Bartley is adamant that Celtic must truly be in dire straits if even Neil Lennon can't get them to perform.
The Hoops boss has come in from flak from all quarters with his side 20 points behind Rangers and the English midfield enforcer knows all about the 49-year-old due to their time together with Hibs.
Bartley has been left stunned by Celtic's performance levels in their consecutive draws with David Martindale's overachievers.
And that's led the 34-year-old - who played against Lennon's side on Saturday - to warn the first team stars struggling for form that they could also be heading for the exit door unless they shape up.
Speaking to Go Radio, he said: "Neil Lennon is the best motivator I have ever had. If he can't motivate you for a game then nobody can.
"Personally, for me, I don't need anyone to motivate me, I'm going out there to do something I absolutely love.
"For me, the minimum requirement is to give 100 per cent every single game.
"As a player, if you're not willing to do that, especially playing at a club as big as Celtic then you are in the wrong sport, it is not acceptable."
The veteran enforcer also doubled down on his previous criticism of star man Odsonne Edouard who he previously claimed was "not invested" in the Premiership champions amid being linked with a money-spinning exit.
The Frenchman was forced into self isolation upon his return from Dubai and missed last night's game at the Tony Macaroni Arena.
And Bartley admits he feels vindicated over his early season verdict despite getting it in the neck from angry Celtic fans before the first clash with Rangers in October.
He added: "We were speaking about Edouard, I spoke about him earlier on in the season, it felt like his head had been turned.
"There had been bids coming and you had people on social media giving it to me saying I was wrong but now you can see it, I believe that is the case.
"Celtic are such a big club, if you don't want to be there, and I am not saying he doesn't want to be there, but if any player doesn't want to be there then go and get someone who does.
"There are so many players in the market that would give everything to be at Celtic Football Club.
"So you shouldn't have players that don't want to be there, don't want to run, that don't want to give 100 per cent, there is so many players that would give you that.
"And you'd much prefer someone giving you 100 per cent with a little less talent than a very talented player giving you 50 per cent."