Falling 18 points behind leaders and Old Firm rivals Rangers with eight games to go has prompted the club hierarchy to act – after a season of slip-ups, sub-par performances and protests.
Speculation and rumour has been rife on the manager’s future for some time – and the betting markets on his successor have been ever-changing.
We look at who could be stepping in for the former Hibs and Bolton boss as his second spell in charge at Parkhead comes to an end.
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13. Paul Lambert
Extensive CV in England and enjoyed successful spell at Parkhead as a player. A frequent defender of Lennon, Lambert is struggling with Ipswich mid-table in League One. 33/1 Photo: SNS Group Sammy Turner
14. Henrik Larsson
The emotional link. Currently assistant to Ronald Koeman at Barcelona - would be a hugely popular selection to follow his former team-mate Photo: Eric Alonso