CRAIG SWAN

As far as Ajer is concerned it’s necessary if he is going to improve and in turn help Celtic get better.

He said: “It’s the most important thing as a footballer.

“It is easy to look through good games when everything is going smooth and you perform well but they aren’t really the important games to look through.

“Those nights when you have been out of position, when you have been struggling and come off and think after the game, ‘I was involved in too many situations tonight’.

“Then it’s important to look through and learn from them. The backroom staff here work incredibly hard. I’ve never been at Lennoxtown when they haven’t all been in and I think it sums up this club. Everyone works so hard.

“I’m a young guy who wants to learn as much as he can. To go through every game with John, who was also a centre-half himself, to learn tactically is very important and helpful for me.

“There’s always something you can pick up.

“As a human you will make mistakes but the important thing is you learn from them and hopefully you won’t repeat them.

“I have looked through the penalty in Rennes several times and learned from that.

“That will not happen again. I have looked through the own goal against Hibs a few times as well.

“I could have and should have done better in France but it’s a learning experience.

“I look through all the clips with Kendo and we try to learn from it. We’ve looked through what we did wrong against Cluj and the backroom staff have worked really hard by showing us footage and pointing out how we can improve.”

Naturally, that Champions League nightmare evening in August has been poured over by more folk than Ajer.

Revenge is a word boss Neil Lennon is keen to banish from the vocabulary yet retribution has to be on the agenda for his troops as the Romanians come calling again in Glasgow just months later.

Ajer was part of a defence that fell apart and shipped four goals on that torturous night but things have changed.

New signings such as Boli Bolingoli and Christopher Jullien, who were both omitted from the tie, have settled into their roles and the Scandinavian believes the rearguard is in better shape to cope with the treat of the Romanians.

Ajer said: “To lose four against