Former Celtic striker John Hartson insists the current crop of player should be embarrassed by Rangers historic title margin victory.
John Kennedy 's final game in charge as interim boss saw the dethroned champions held to a stalemate against Hibs, while rivals Rangers secured an unbeaten league season.
It goes down in the archives as the biggest winning margin Rangers have ever held over Celtic at 25 points - topping the 21 point win during the ill-fated John Barnes era.
The Welshman didn't pull any punches on the Go Radio Football Show as he took aim at the showing from the players as the season ended on a whimper at Easter Road.
He believes the relentless Ibrox side should get all the credit - but believes serious questions have to be asked ahead of next season.
Hartson said: "Celtic will certainly be feeling it. Whatever way you want to way it up this season, Celtic have just not been on the level of Rangers right from the off.
"Rangers sort of put a marker down and went from strength to strength.
"Lets look at the stats for a minute; conceded 13 goals, not been beaten, beaten Celtic four times, knocked Celtic out of the Scottish Cup, and they have just went from strength to strength.
"They have added players as well through and the recruitment was very good at the start of the season, and for me you can't take anything away from them.
"I have to say as a former Celtic player I don't like it, but I'm impartial enough to give players and a manager credit where it is due.
"There is no doubt about it Rangers have been the best side, not just by a little bit, but by a country mile. It's 25 points.
"If I was a Celtic player I'd be embarrassed, I'd be embarrassed with that sort of result.
"Celtic now have to respond. The fear is with the Celtic supporters; football isn't a switch.
"You can't just turn it on and turn it off, and say this will be good this year. You've got to work at it.
"You've got to have the togetherness, the desire, and buy the right type of players, like Celtic have shown over the past nine years.
"They have been remarkable, but they have to respond."