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.
Neil Lennon's Celtic claimed a much-needed win against Lille to ensure they ended their Europa League campaign on a high note.
Milan responded in style to going 2-0 down against Celtic on Thursday, much to the delight of head coach Stefano Pioli.
Jens Petter Hauge scored one and created another as Milan sealed their place in the Europa League knockout stages.
Celtic have won just two of their past 10 games in all competitions, leading to large-scale fan protests outside the club's ground.
Milan will have Stefano Pioli back in the dugout after a three-game absence with coronavirus and the head coach is looking forward to it.