CELTIC PARK will host a title party on Sunday afternoon.

The usual fanfare will greet the presentation of the SPFL trophy but among the visible celebrations it is that which cannot be seen from which Ronny Deila, the Celtic manager, will draw the most pleasure.

The Norwegian believes that securing Celtic's fourth successive championship has underpinned the trust between himself and the Celtic support, a relationship that was uneasy in his early, tumultuous weeks in charge of the club. At the height of summer, those dark days cast a long shadow over Deila's initial reign, but it is the words he first spoke when he was unveiled as Neil Lennon's successor in June last year that Deila believes he has delivered on.

And it is the belief from those around him that he is capable of fulfilling his long-term philosophy for the club that Deila has derived the most satisfaction from this season.

"Trust is something you build over time and you can ruin it in one second if you do something wrong," said Deila. "So you have to keep building trust both ways. This is a reward for good work for everybody and it is important we celebrate that together. I have talked all the way about development and I think people are starting to trust that what I talk about I am trying to do.

"We see improvement in the team, we see improvement individually and we can see the club is trying to get better players and key players and we are working on the culture of things. You can see the way we want to play - an attacking style and an intensive style of play. What has been said the first day you can measure a lot of these things in what was the goal before the season.

"I am not so into holding the trophy. That is not the biggest thing. The way to it has been the biggest thing. I have seen the improvements we have made. Things are positive and that is what we have to build on. That is the fun part."

The building that comes now is certainly the interesting part. The challenge is to maintain the domestic supremacy that the Celtic support will demand while also making inroads into the UEFA Champions League. Uppermost in the minds of Deila and chief executive Peter Lawwell over the coming weeks is creating a squad they believe will be strong enough to negotiate those three qualifying rounds, the first of which will take place mid-July. Deila will attempt to take some time off, although he will rarely be without a phone glued to his ear.

Ideally the club would look to conclude business early, but that task is complicated by a number of factors. Financially the demands of players and clubs are high at this time of year while players also opt to see what other options may present themselves as the weeks go by.

"I am working all the time," said Deila. "I will go away but I will always be on the phone and following everything with Peter. We have done good work so far for the transfer window but it is very hard, especially to get things early as it is doubly expensive as it normally is so we carry on working hard and we will see where we are going.

"Everybody has to know that we want to have a good window so that when we meet up in June we are even stronger. That is what everyone wants. Everyone at the club. But you can't be stupid. You have to do the right things. There has to be sense in what we are doing. One thing is to agree with the player but then you have to agree with the club. It is not only one thing. We are working and we will see what is happening.

"You never fully switch off. It is different than going into work every day. You can relax more and be together with people you love to be together with and have some time off and some sunshine. "

It is not just adding to his squad that will present a challenge to Deila; maintain the one he has will be equally tough. Jason Denayer will return to Manchester City after Sunday's game against Inverness Caledonian Thistle while Celtic's resolve over Virgil van Dijk is bound to be tested throughout the transfer window. Midfielder Nir Bitton has been linked with a move to Sunderland, interest that Deila shrugged off.

"I am happy to hear that people are interested in Nir," he said. "There has been tremendous development and he is a great player but again he has got to stay here and develop more. He needs more games under his belt before he can make the next step but he is a great talent and a great boy."

Meanwhile, Stefan Johansen has urged his colleagues not to be 'lazy' this summer as they head off on holiday. Mindful of the immediacy of the Champions League qualifiers, Johansen believes that there is an element of responsibility that the players must pay heed to.

"The most important thing is that we use the holiday's right, we don't just be lazy and lay on the beach all day," said the SPFL Player of the Year. "You know the games are coming up early so you need to be fit and be ready for it. It should take one or two weeks and we'll be back to football fitness."