CELTIC defender Kristoffer Ajer has committed his future to the club with a new four-year contract.

The 20-year-old has enjoyed a breakthrough season with the champions, making 33 appearances in all competitions and earning his first senior cap for Norway. 

Ajer put pen to paper on a new deal until 2022 on Monday morning. 

The centre-back joined the Hoops in July 2016 from Start and was sent out on loan to Kilmarnock for the second half of last season.

He made 16 Premiership appearances at Rugby Park and has become a regular in Brendan Rodgers' line-up since breaking into the team in December.