The external face of Celtic Park has become a tribute to the drama that has unfolded inside it.

A colourful montage of iconic games, players and managers adorns the edifice of the stadium with Brother Walfrid, Willie Maley, Jock Stein and the Lisbon Lions rubbing shoulders with more recent heroes.

The likes of Henrik Larsson, Martin O'Neill and Neil Lennon are all up there, their very presence beaming out a reminder of the heights the club has reached.

The past is well represented. But there is an empty space. A gap for the future, a question mark over that which is still to come.

And Ronny Deila believes he is capable of filling it.

The Celtic manager lifted his first SPFL trophy on Sunday when his side saw out the season with a resounding 5-0 win over a weakened Inverness side.

Prevailing over a season of domestic success has brought him some satisfaction but it is the foundations which he believes he has laid that can have a significant reach as Celtic seek to spread their wings further afield.

"I think we have to see the improvement we have made from the start until now and the best way to do that is with stats - the games we have played, the points we have taken, the goals we have scored, the goals we have conceded," he said. "We have good control over that and it is something we monitor a lot. So I can see that we have been getting better and stronger as the season has gone on.

"The game against Inter Milan also showed us that we have taken some steps forward. The Europa league gave us a chance to keep improving.

"It was important to us this season and I think we can take a lot of lessons from that into the European games this summer.

"I feel much more safe than I did this time last year, that is for sure. I feel that we have laid good foundations now and it is up to us to go on and build on that."

There is an argument to suggest that entry to the Champions League group stage and the financial rewards which it brings is a bigger achievement than winning the title.

Deila was reluctant to place one ahead of the other, but can appreciate just how pivotal the qualifying games are to the season as a whole.

"It is up there," he said. "Without the league there would be no Champions League so it is hard to say that one is more important than the other.

"But I think it would be a big achievement for us to get into the group stages of the Champions league because everyone can see how difficult a task it is.

"We are in a good place going forward. Charlie Mulgrew has played some football and will go away with Scotland so he will be fit when he gets back and Mikael Lustig should also be ready to come back into the team.

"Mikael is an experienced player and he is another player who is a leader. He is good in the air and he is a very good football player so it definitely makes the squad stronger."

For Deila, the chance of some down time is vital now.

The physical tiredness he feels after overseeing this season is nothing compared to the mental fatigue and he will look now to stretch his legs in new places and turn off his mind.

Getting a suitable rest, however, is made all the more challenging since he will be in almost daily contact with Peter Lawwell as the duo work to bring players into the club.

"I am going to Norway for one week and then I will go abroad to a few different countries and do a little travelling," said the Celtic manager. "I will be in touch with Peter all the time because we have a lot of things we want to work on as we try to make the squad stronger.

"But it is important too that I have some mental time. It is good to stop thinking every day about getting up and driving to work.

"I will always have my mind on the job and what I want to do, but it is important to also have a mental break and try to reflect on what has worked this season and what has not.

"We have had a lot of challenges this season. It is a club where every day is intense. I want to go away for a bit and come back with a clear plan on what I want for next season. "

Watched by his parents, Arne and Dove, and twin daughters Live and Thale on Sunday afternoon as the league trophy was presented, Deila's name was loudly chanted by the Celtic support.

And the recognition that he has won his place in the affections of the fans is something that Deila has welcomed.

"If you don't share moments together they are nothing," he said. "The most important people in your life need to be with you when you experience things and it was great to have my parents and my daughters here. The day would not have been the same without them.

"Without the supporters we are nothing. That is why Celtic are so big. That is the biggest thing I am pleased with - you can see people are happy with the way we play and they can see improvement, they are excited by how we play. It is a sign for me that we have done something right but we want to build on that relationship even more and I will do everything to keep improving."

"I see myself here for a long while, although you never know in football.

"I love Glasgow, I like the people. I am happy. I want to continue."