Brendan Rodgers has called for a full inquest into Celtic's miserable transfer window.
The Friday night sale of striker Moussa Dembele to Lyon for £20million put the seal on a frustrating 12-week period for the Parkhead boss, who saw a series of targets slip through his fingers.
Although the club broke its transfer record to seal the permanent signing of French forward Odsonne Edouard from Paris Saint-Germain, moves for midfielder John McGinn and defenders Cristiano Piccini and Scott McKenna each ran aground.
Brendan Rodgers has called for a full inquest into Celtic's miserable transfer window
The sale of Moussa Dembele to Lyon put the seal on a frustrating 12-week period
Deadline day saw free agent Youssouf Mulumbu sign a two-year deal and Leicester City defender Filip Benkovic join on loan but, speaking ahead of Sunday's first Old Firm derby of the season, Rodgers admits the club's recruitment had not met his requirements.
He will sit down with the club hierarchy to rake over the coals of a period in which the club also suffered Champions League elimination.
He said: 'You have to review - it is important. I felt it was a straightforward window for us, and it was twofold - keep the players we wanted to keep, then add the quality into key areas of the field. I didn't think we needed many.
'But it's never as straightforward as it should be sometimes.
'It's clear it hasn't been an ideal window for us but we'll look at the processes and everything else around it. We'll review it all and try to ensure in the next window we can be better.' Rodgers relationship with club chief executive Peter Lawwell has appeared strained over the past few weeks, while questions have also been raised around the role of head of recruitment Lee Congerton, who was appointed in March 2017.
'It has been a busy period and we will assess it after this period is done,' he added.
'There are clearly things we can improve on and be better at. But, listen, this is management, it is not always smooth and everything going nice.
'So you just have to deal with it and focus and concentrate on what you do, which is the coaching, the preparation of the team and sending them out there to perform at the best level that they can.'
The sale of Dembele has narrowed Rodgers' attacking options going into Sunday's home game
The sale of Dembele, a talismanic figure in matches against Rangers over the past two years, has narrowed Rodgers' attacking options going into Sunday's home game, the first against the Ibrox side with Steven Gerrard at the helm.
However, with Edouard back in full