Martin O'Neill has been handed the reins at Celtic Park for a second stint this campaign, with the club confirming he will serve as interim manager through to the season's conclusion.
The 73-year-old Northern Irishman returns following the swift departure of Wilfried Nancy, whose tenure lasted a mere 33 days.
Nancy managed just two victories from his eight matches in charge before the club parted ways with the Frenchman on Monday.
The former manager of Leicester City, Aston Villa and Sunderland previously held the position on a caretaker basis after Brendan Rodgers stepped down in October.
Martin O'Neill has returned to Celtic for a second time this season
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During his brief spell, Nancy oversaw a damaging 3-1 defeat to Rangers in the Old Firm derby on Saturday, a result that hastened his exit from Parkhead.
His tenure also included a disappointing League Cup final loss to St Mirren, a competition in which O'Neill had guided the Hoops past their Glasgow rivals in the semi-final.
The contrast between the two managers' records is stark.
O'Neill secured seven wins from eight fixtures during his initial caretaker period, triumphing in all five league encounters whilst conceding just a single goal.
His impressive run made him a natural choice for the club's hierarchy to recall.
Celtic only hired Wilfried Nancy as manager last month | GETTYO'Neill expressed his delight at being asked to take charge once more. "I am really pleased, in fact, very honoured to be asked back to manage the team again and I am looking forward to getting back to work again with the players," he told club media.
The veteran manager offered gracious words for his predecessor, describing Nancy as "a fine man" who would undoubtedly find success elsewhere in football.
Looking ahead, O'Neill emphasised the need for collective effort. "My focus will be to try and get us back to winning ways if we can. We will need everyone right behind us," he stated.
Martin O'Neill established himself as a Celtic icon during his time in the dugout | PAThe Hoops currently occupy second place in the Scottish Premiership, trailing Hearts by six points whilst sitting level with Rangers but ahead on goal difference.
Interim chairman Brian Wilson spoke of the club's confidence in O'Neill's return, describing him as a manager with "a peerless reputation in football and a deep commitment to Celtic."
Wilson appealed for supporters to unite behind the team as they seek to recover lost ground.
Principal shareholder Dermot Desmond, who first brought O'Neill to Glasgow in 2000, expressed hope that the manager could replicate his previous achievements whilst wishing Nancy well for the future.