Celtic got one over bitter Old Firm rivals Rangers again on Sunday, coming from behind twice to snatch a 3-2 win despite playing with 10 men for 30 minutes.
Centre-back Jozo Simunovic was give his marching orders after an elbow on Alfredo Morelos, leaving the visitors' defence with much more work to do.
Hoops manager Brendan Rodgers trusted 19-year-old Kristoffer Ajer with the responsibility of filling in for suspended right-back Mikael Lustig, and the teenager hardly put a wrong foot forward.
Having already put in several stellar performances that caught the eyes of manager Lars Lagerback this term, Ajer has finally been called up to join the Norwegian senior team as revealed by Celtic's official website.
The former Lillestrøm and Start defender, who arrived at Celtic last summer, will join the team to prepare for their friendlies against Australia and Albania during the coming international break.
Ajer has made 16 Scottish Premiership appearances for the Hoops this term since establishing himself in Rodgers' first-team plans, but his impressive performance against Rangers helped prove he has now come of age.
The Old Firm game remains the biggest in Scotland, and if Ajer can prove himself in such a high-profile clash, he Is definitely ready to make his international bow for Norway.
Thanks to Rangers, the Hoops starlet could soon make the first of many international appearances for Norway.