The Celtic youngster won Man of the Match in the pre-season friendly win.
The youngster was one of the first new signings at the club this summer, having been captured by former manager Ronny Deila.
He made a surprise home debut on Saturday afternoon as Brendan Rodgers called upon him early on in the pre-season friendly with German side Wolfsburg after Erik Sviatchenko picked up a head injury.
Following a nervy start he soon settled and ended up putting in a top performance that saw him named man of the match in the 2-1 win.
And reacting to his performance, Ajer says it was amazing to have played in front of so many people for the first time.
“Running out there without warming up and I did some mistakes in the beginning that I’m not proud of but after a while I performed well,” he told celticfc.net.
“[It’s] the biggest experience I’ve played in front of was 12,000 so playing in front of so many people was amazing.”
It now remains to be seen if Ajer can become a regular in the Celtic line up next season under Rodgers.
He was principally brought in as a midfielder, but this performance shows that he may have a future in the heart of the defence instead.
With that area being a particular weak spot for the Scottish champions, and Efe Ambrose coming in for consistent criticism, there is every chance for Ajer to establish himself in the position.