Aiden Headridge, of Dundee, wrote to Celtic FC to be 'considered' for the role - and he even got a reply from the club's chief executive Peter Lawwell.
In a letter to the youngster, Lawwell, said: "As you will now know, we have appointed Ronny Deila as the new football manager. I believe Ronny has the knowledge, enthusiasm and confidence that is necessary to take the club forward and deliver continued success.
"I am very excited about this new phase in the club's history, and I hope that you and your family are too."
He added: "I was really pleased to learn that you would like to be the Celtic manager and maybe one day that will happen.
"In the meantime, I hope you are enjoying school and are looking forward to the summer holidays."
The club also sent Aiden a gift and his delighted brother Ciaran tweeted, "My 6yo brother wrote to @celticfc about becoming new manager, and club sent this back. Will put a smile on his face!"
Deila signed a 12-month rolling contract with the Hoops earlier this month following Neil Lennon's departure from the club.
It was announced yesterday that former Celtic player John Collins would take on the assistant manager role at the Parkhead club.