Celtic manager Neil Lennon has resigned following Sunday's 1-0 loss to Ross County, which left the Hoops 18 points behind Rangers.
Erling Haaland is wanted across Europe and Real Madrid are plotting their move.
Having publicly offered to step down on Tuesday, Andre Villas-Boas is now facing Marseille disciplinary action.
Andre Villas-Boas learned of Marseille signing Olivier Ntcham from the media and responded by submitting his resignation.
The transfer window closed on Monday, with Premier League holders Liverpool busy addressing their defensive problems.
Celtic manager Neil Lennon and 13 players are isolating due to coronavirus but the club insists "rigorous" protocols were followed in Dubai.
While he is not looking at their 19-point lead, Steven Gerrard felt Rangers proved a point with their battling victory over Celtic.
They did not offer much attacking threat against Celtic, but Rangers earned a priceless victory that moved them closer to league glory.
As interest builds in Erling Haaland, Manchester United could look elsewhere.
Hearts came agonisingly close to denying Celtic a 12th consecutive domestic trophy, but the Hoops made history at Hampden Park.