3 Celtic stars failed their Rangers test and showed Ange exactly what he needs when the transfer window opens

There are some managers who would have taken Saturday's result at Ibrox with a shrug of a shoulders given that the league has been won and the team are still 10 points better off than the one that cuffed them 3-0.

But if we've learned anything from the last 20-odd months, it's that Ange Postecoglou is not that kind of guy. Make no mistake, Celtic's manager won't disregard the result or his team's performance in Govan at the weekend.

He might not have been ranting, raving or kicking tea cups around the visitors' dressing room. In fact, it's unlikely that he'd have shown signs of being visibly angry. But behind the cold hard stare and the stubble on his chin and cheeks, there will have been an uncompromisingly hard assessment of the facts that might add up to bad news for some of those at Celtic Park who have been happy to hang onto the coat-tails of the stalwarts who have driven the champions to the brink of another Treble.

Postecoglou knows he can put his mortgage on the likes of Cameron Carter-Vickers, Callum McGregor - although more of him later - Reo Hatate and Kyogo Furuhashi playing to the standards he demands. But on Saturday, with the league sewn up, the Aussie threw Alexandro Bernabei, Yuki Kobayashi and Oh Hyeon-Gyu into a Bear pit to see how they'd react.

Fifty-two thousand Rangers fans, no Celtic support. A test of their mettle as well as their maturity. The Argentine, Japanese and South Korean were a long way from home in every sense and way out of the comfort zone of cameos against the lesser lights in which they've looked happy enough.

He didn't get the answer he was hoping for. But he got one that will tell him that these fringe players are nowhere near ready to take his club to the places he has