Celtic have parted company with manager Tony Mowbray following Wednesday’s humiliating 4-0 defeat at struggling St Mirren.
The defeat meant that Celtic trail Scottish Premier League leaders Rangers by 10 points, having played two more matches than their Old Firm rivals.
Coach Neil Lennon will oversee first team matters until the end of the season.
Lennon played for Celtic between 2000 and 2007, captaining the club in his last two seasons.
The move comes after assistant manager Mark Venus and first team coach Peter Grant departed along with Mowbray.
“It is not good enough for me, the players and the fans,” Mowbray said after the defeat to St Mirren. “We all accept that but I take responsibility.”