Martin O'Neill's choice to remain as Celtic manager after securing the league title last season has been called a significant mistake, one that is now potentially harming his legacy. The club's current struggles, marked by a run of three wins in their last ten matches, have led to growing fan dissatisfaction and questions about O'Neill's tactical approach and connection with the players.

While O'Neill's side still tops the league table, the author argues this is a sign of deflection and denial rather than genuine success, suggesting it insults the intelligence of Celtic supporters. The sentiment is that O'Neill, who came out of retirement twice to answer SOS calls from the club last season, should have recognized the dramatic league title win as a fitting end to his tenure. His decision to stay on, driven partly by a desire for European success and a perceived "bulletproof shield" by the board, has instead led to a situation where his presence is seen as detrimental.

The article draws parallels to situations like a hypothetical return of Sir Alex Ferguson to Manchester United, emphasizing that past achievements do not automatically justify continuing in a role when current performance is lacking. The failure to separate nostalgia and affection for O'Neill from the practical needs of the club moving forward into the new season is described as a "catastrophic error of judgment" by the Celtic board.

This sentiment is amplified by the reported loss of faith from both fans and potentially players. O'Neill's situation is compared to previous Celtic managers like Tommy Burns and Billy McNeill, who were sacked, suggesting a belief that O'Neill is somehow immune to such outcomes is naive. A growing section of the fanbase reportedly views him as an extension of major shareholder Dermot Desmond, with his icon status fading.

Recent reports also highlight parallels with O'Neill's previous sacking as Nottingham Forest manager in 2019, where he reportedly lost the dressing room and was criticized for a lack of tactical detail. Comments from current Celtic players like Callum McGregor and Cameron Carter-Vickers in recent weeks suggest a team lacking tactical identity, a situation difficult to rectify as long as O'Neill, along with coaches Shaun Maloney and Mark Fotheringham, remain in place. The club's chief executive Michael Nicholson and chairman Brian Wilson have reportedly faced "hard but fair" questioning from supporters regarding the team's current malaise, while major shareholder Dermot Desmond remains largely removed from such scrutiny. The core question emerging is the justification for O'Neill's continued role as Celtic manager.