Peter Lawwell was involved in a heated debate with Celtic diehards over the club's lack of transfer activity after their 3-0 victory over St Mirren in Paisley.
The Hoops have made four signings so far this summer, but two of those - Paulo Bernardo and Adam Idah - were on loan at Parkhead last season.
The champions are in need of another left back to offer competition to Greg Taylor, while the pending sale of Matt O'Riley for a club record fee will leave a creative void in midfield.
Lawwell returned to the club as non-executive chairman last year, having previously served as Celtic's CEO between 2003 and 2021.
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