RONNY DEILA insists Celtic's big-name stars don't need to leave Parkhead to improve themselves this summer.

The Norwegian was appointed as Neil Lennon's successor in the Hoops dugout on Friday and faces a crunch few weeks as he prepares his new squad for the first of what he hopes will be three Champions League qualifying rounds.

He has been given a budget to strengthen his group in the transfer window but will face an anxious wait to discover if the likes of Fraser Forster and Virgil van Dijk will be heading for the exit doors after continually being linked with moves away from the club.

Deila has forged a reputation as one of the brightest young coaches in the game during his successful spell with Stromsgodset and is determined to use his skills to make the current crop of champions even better.

He said: "What I get energy from is developing teams, individuals and myself. When you do that well, you win trophies.

"I can develop Van Dijk here as well. That is what I have done at Stromsgodset and that is what I will do now. I have one thought in my head, I have to get the best out of my players and my staff and myself.

"If we do that, why should we be bad? We are going to have a good season. Of course I know you will look at results. I look at development too. Both are important. If you get the development then you get results.

"There are two ways to go - to buy players or develop them. Celtic is a big club and we need to develop players to European standard."

Despite a host of high-profile candidates being linked with the Hoops top job, it is Deila who the Parkhead hierarchy have turned to as they completed their search for Lennon's replacement.

The 38-year-old has taken a studious approach to the game as he has travelled the continent to expand his knowledge and talents and has plenty of optimism about the squad he has been left as he looks to implement a style at Celtic.

Deila said: "Liverpool was good, maybe too much sideways! It was fun seeing Jan Molby in midfield, but Kenny Dalglish was a fantastic player and John Barnes was my favourite.

"I loved Barcelona under Guardiola and how Dortmund are playing. Also things like Atletico Madrid and the intensity in their defending.

"Everything starts with a good defence and Neil Lennon brought unbelievable defending last season.

"I saw it in the Champions League, 11 players well organised and working well together. With that spirit, you go far and then on to skill with speed and relations in the team so things go quickly to give opponents problems."