The 42-year-old was originally coming in from Scottish Rugby in the summer.
Dermot Desmond says Peter Lawwell and Dominic McKay will both be involved in finding Neil Lennon's replacement.
Rangers are just four points away from being crowned domestic kings for the first time in a decade.
The 21-year-old Nigerian midfielder will move to Ibrox in the summer on a four-year contract.
Celtic boss says his side in much better shape than in the weeks following their October defeat to Rangers.
Neil Lennon's men are 13 points adrift of rivals Rangers but have two games in hand in the title race.
The warning comes from Aberdeen chairman Dave Cormack as they announced operating loss of £2.92m.
Cases of Covid-19 confirmed at Pittodrie a day after lockdown restrictions were reintroduced in the city.
The SPFL have announced the fixture list for the coming season.
The first Scottish Premiership clubs return to action after three months off due to the coronavirus pandemic.
The Parkhead club have been awarded the Scottish Premiership title.
The Tynecastle side are four points adrift at the foot of the Scottish Premiership after a 1-0 loss to St.Mirren
A Ryan Kent goal helped Rangers take all three points from the Highlands on Sunday.
Celtic have increased their lead at the top of the Scottish Premiership to 16 points with a win over St Mirren.
Celtic striker said there was no other place he could put his foot during clash with Sam Woods.
The former England international has spent the last year with the Light Blues on loan from Bournemouth.
The Celtic boss insists his side are in a good place going into the second half of the season.
The Hamilton chairman has called for a gambling amnesty in Scottish football.
