Kristoffer Ajer is one of Celtic’s most promising young players and the central defender is celebrating his birthday today.

The Hoops haven’t played in a while, and aren’t likely to do so for the next few weeks, but it’s been a generally positive season for the club, with Neil Lennon’s side sitting pretty at the top of the Scottish Premiership.

Ajer has played his part in the success so far and will hope to continue when he pulls on the green and white shirt next.

How well do you know the birthday boy? Take our quiz to test your knowledge!

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Ajer turns 23 today