Not only did he have the necessary confidence in his own ability to stick his hand up to take the penalty in a game of that magnitude, but he was able to hit it with such conviction.
For the best part of two or three minutes he had to ensure the nonsense of the Ajax players trying to put him off.
To be able to not only hold your nerve but dispatch such a strong penalty says so much about him.
It really augurs well for the future. If at this stage of your career you have the necessary guts - and trust me, it takes a lot of backbone to step up and take a penalty in a game like that where the first goal in particular is always going to be so crucial - then you have to feel confident that he really will be a hugely influential player over the years.
Neil Lennon speaks very highly of him publicly and he is an outstanding talent.
He has had a difficult time recently because of injury and illness and you would like to think that the fitter and stronger he gets, the better for Celtic.
If he can get a few more games under his belt before the next then it can hopefully give Celtic something extra again over in Amsterdam.
You can always tell the players a manager trusts when it comes round to the big games - and you see quite clearly what Lennon thinks of him.
Even as a kid, the manager was prepared to throw him into the big games.
I am sure that much of their relationship will stem from the fact Lennon would have really got to know him as a player and as a boy when he first returned to the club and was in charge of the development squad.
So far the lad is really living up to his billing. If he can stay injury free you'd like to think he can kick on and make his mark on this season now.