Leigh Griffiths has no doubt Allan has the class and the quality to get pitched into the first team in a crucial must-win confrontation for the Hoops, who are bottom of Group A on two points without a victory in four outings.
“The position Scotty plays in has made it difficult for him in terms of games. He can play a couple of roles, but when you look at the likes of Stefan Johansen and Scott Brown then it has been hard for him to get in.
“I’m sure, though, that he will take his chance when he gets it. He has been looking really sharp in training, always trying to get on the ball and make things happen.
“If he gets the shout against Ajax then he will be looking to impress the manager.
“Overall, I would say the boys are excited. It is a big-name team coming to Celtic Park and we need to win the game.
“The lads who are out will be disappointed, but it’s an opportunity for others to come in.
“We have boys who are capable of doing a job. We saw it last year when Stuart Armstrong and Gary Mackay-Steven got dropped in at the deep end against Inter Milan and how well they played that night.
“This will be no different. The boys coming in know what is at stake. We need to put on a performance for the manager and for the fans.