Former Celtic boss Neil Lennon has told the club not to panic in the summer transfer window in their bid to improve ahead of next season.

The Bhoys wrapped up the Scottish Premiership title over the weekend but it has been an otherwise disappointing campaign, as they struggled in Europe, failing to qualify for the group stage of the Champions League, and were also knocked out of the Scottish Cup by bitter rivals Rangers.

Under-pressure manager Ronny Deila has already revealed he will leave Parkhead after Sunday’s final game of the season against Motherwell and the club are still to appoint his replacement.

Lennon has been mentioned for the role and would be a popular choice, having won the title five times as a Celtic player and three times as a coach before leaving in 2014 to seek a fresh challenge.

The Glasgow outfit’s lack of European progress has led to calls for an overhaul of the squad in the summer although the Northern Irishman believes it would be a mistake for the board to get carried away.

Instead, the 44-year-old feels the club’s current players need to lift themselves, something he believes will be inevitable with a new manager set to arrive.

“I don’t think it’s going to take major rebuilding,” he told talkSPORT.

“I just think some players have underperformed this season, and when a new manager comes in, hopefully he can get them up and at it again.”

Wednesday sees the Bhoys travel to fourth-placed St Johnstone for a game they are 1.44 to win, with the draw 4.33 and the Saints 6.50.