Pundit Chris Sutton has claimed the reason for Ange Postecoglou's sharp response to an interpreter in Poland came from his frustration at only drawing in the Champions League.
The Hoops were the better side under every measurement against Shakhtar Donetsk and should have put the game beyond doubt with more goals.
But they were left frustrated by profligate finishing, good goalkeeping and a Callum McGregor error, leaving Poland with a point when it should have been three.
After the match, in a clip that quickly went viral, Postecoglou snapped at an interpreter who asked him to speak more directly into his microphone. It was the second time the quietly spoken Aussie, who could be clearly heard, was interrupted by the same individual after he had done the same pre-match.
And Sutton reckons the normally ultra-composed Aussie wouldn't have reacted had his team taken their chances.
He told the Daily Record: "The poor interpreter copped it after the final whistle but you don’t need to be fluent in five languages to know the real source of Ange Postecoglou ’s frustration.
"The Celtic manager was fizzing that his side’s superb performance against Shakhtar Donetsk in Poland didn’t result in three points in the bag. And that sense of bubbling ire under the surface is what sums things up for Celtic and Postecoglou right now.
"They are bitterly disappointed at just getting a point on the road in the Champions League. For me, that just shows how far they have come. It’s incredible the improvement in Europe from last season. If Celtic had secured a draw after being backs to the wall for 90 minutes then we would have hailed it as a battling result. Instead, there is a huge feeling this was a missed opportunity to collect maximum points.