O'NEILL: IT'S A SORE LESSON

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WORK TO DO Gaffer O'Neill

mentality as ability and gave a clear indication of the massive work needed to be done to get Celtic back punching properly on the continent.

Asked if the Danish pasting was a reminder of the work the Hoops have to do in Europe, he said: “Of course. Absolutely. I couldn't agree more.

“European football is where this club, because of the great Jock Stein, has been a priority. But tonight there, it can show you, the very obvious thing is we have to improve.

“That's a big lesson for us, to know what it takes to be a really decent European team.

“You've got to hang in. Until you get regrouped, whatever you do, don't concede a second goal.

“Just to play football at the top level, not only do you need ability but you need mentality. And mentality sometimes overrides ability as well.

“I've seen this game where players with lesser talent but more drive and more determination come through. And players who have the talent but don't have that mentality fall by the wayside”