KRISTOFFER AJER insists he is happy at one of the 'world's biggest clubs' despite Norway boss Lars Lagerback appearing to suggest he could improve by leaving Celtic.

The central defender enjoyed an excellent season with the treble Treble winners as Celtic romped to eight-in-a-row.

But Norway manager Lagerback believes the 21-year-old, who is preparing for their Euro 2020 qualifiers against Romania and the Faroe Islands, could be even better if he left Celtic for a bigger club.

He said: "I don't think the Scottish league inhibits his development, but it's fair to say if he became a regular starter at a higher level, it would probably speed it up.

"The harder the level you are at, the more you have to be on your toes.

"But to be fair, it's about him being at a club where he gets playing time and Celtic do have Champions League matches every season so he is in a good environment.

"I think he takes less risks than he used to in his game, but that comes with experience."

But Ajer insisted he couldn't be happier at Parkhead.

He pointed out: "I have a three-year deal at Celtic and I am one of the world's biggest clubs. I love to play there.

"That's the only thing I am focusing on.

"It's a really exciting time. Neil Lennon has come in and done a very good job. We won the Treble.

"It's fantastic to be in Glasgow. I am looking forward to next season.

"The past six months have undoubtedly been the best in my career. I have played all the matches and performed well with the rest of the team. It's been really good."

And Ajer recalled how he made a young Celtic fan's day after his last Old Firm home win.

He explained: "There was a young boy who ran onto the track when everyone was celebrating our 2-1 win.

"I gave him a shirt, but it was confiscated by the stewards after it.

"I managed to send a message to his father on Instagram – it was actually the boy's birthday that day.

"I agreed to meet him at Celtic Park before we went to an away game and I gave him the signed shirt for his son.

"Of course, he was incredibly pleased.

"The fans are the people who mean everything in football. I play in front of 60,000 home supporters every game,and they were voted the world's best supporters last year.

"It goes without saying that they mean a lot to the club."