Chris Sutton feels Celtic are "probably the best team in Scotland at the moment" and feels their champagne football will have Rangers running scared.
After a rocky start under new manager Ange Postecoglou, the Parkhead club have put in a string of strong performances in recent weeks.
That culminated with a 2-0 win over AZ in the Europa League, and the Parkhead icon couldn't help but rub it in to Rangers rival Ally McCoist.
Sutton said on BT Sport's Scottish Football Extra: "I notice we're starting with probably the best team in Scotland at the moment.
"Champagne football, champagne Celtic: McCoist must be getting worried.
"They played very well again, Joe Hart made a big save early on in the game but they are playing with such intensity and desire, a fire in the belly.
"Going forward they're creating chances, I'm still a little bit worried defensively but I tell you what: Ange Postecoglou, in the space of a couple of months, he said he was going to come in and change the way that Celtic play and he has been good to his word.
"I'm still worried a little bit defensively for Celtic, and they're still a work in progress, but it's been such a positive start from Celtic under Ange."
McCoist wasn't taking that lying down, asking whether it was Celtic or Paris Saint-Germain his colleague was describing.
But Sutton insists there's reason to believe for his old club.
He continued: "The way the team have played in recent weeks, Furuhashi coming in and showing that dynamism, Celtic fans have hope.
"When they see what's happening across the city - and Rangers are creaking, the old bigheads across the city getting carried away with themselves.
"I don't know, there's just a bit of hope."
