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Borussia Dortmund have set their sights on Celtic star Kristoffer Ajer after being impressed by his performances in Hoops.

The defender has enjoyed a brilliant few months and started both games for Norway in their recent friendly victories, and now the German giants are reportedly keen to strike.

Dortmund could use all the help they can get after a 6-0 thumping against rivals Bayern Munich and are ready to make contact, according to the Sunday People.

The 19-year-old is tied down at Parkhead until 2020 and Celtic are reportedly prepared to extend his stay after becoming a mainstay in the defence.

The stopper has made 26 appearances in all competitions and has earned plaudits for his calmness in possession and his physicality in aerial duels.

Ajer joined from IK Start in 2016 and enjoyed a successful loan spell with Kilmarnock last season.