The 17-year-old midfielder will join the Glasgow side in June from his current side IK Start as a free agent. In January the tall teenager had a week-long trial with Ronny Delia’s side and plans for a move were halted until the summer.
Speaking to the Celtic club website, Ajer said: “Coming here to play for one of the greatest clubs in the world is amazing and I can’t imagine how wonderful it will be to play.
“It’s a great honour to sign for this big club. I am only 17-years-old and I have already achieved one of my biggest dreams so I can’t wait to start here at Celtic and develop as a player.”
Despite his young age, Ajer has made nearly 50 appearances in the Norwegian Premiership and he became the youngest player to captain a side in the Norwegian top tier when he was handed the armband against Lillestrøm as a 16-year-old.
Ajer said: “As a player I need to develop more. I have been at IK Start for two years now and they have been great. I have had playing time and I have played a lot in the Tippeligaen, but now I feel ready to move forward.
“For the whole time, Celtic has been my number one club and I wanted to come here. The trial was amazing. I met the staff, the players and everyone took good care of me. I felt at home here and the people around the club and everyone in Glasgow were so kind, so I had no problems being welcomed here, it was really good.”
The self pro-claimed defensive midfielder has notched up an impressive 13 goals and five assists in 45 matches for IK Start and he will look to continue that form at Celtic.
The teenager added: “I’m a holding midfielder that likes to be on the ball and likes to win it back again. That’s what I have done at Start and what I plan to do here.
“I have many role models that I have watched on YouTube, such as Patrick Viera who is a great player in that position.”
Below are some highlights of Ajer’s brightest moments at IK Start.
Footage courtesy of FBtalentsHD