Neil Lennon will want answers if Ryan Christie is not allowed to play in Saturday's Old Firm derby against Rangers, suggesting isolation rules are being applied differently in England and Scotland.
Celtic midfielder Nir Bitton has tested positive for the coronavirus while on international duty with Israel, likely ruling him out of next weekend's Old Firm clash against Rangers.
Kilmarnock's league match with Motherwell was been postponed on Saturday (AEST) after the club's entire first-team squad was instructed to self-isolate.
Celtic and Aberdeen have each been fined £8,000 by the Scottish Professional Football League following breaches of coronavirus protocols.
Celtic moved top of the Scottish Professional Football League for the first time since the opening weekend of the season after coming from behind to beat bottom side Livingston 3-2 on Sunday (AEST).
Lewis Ferguson kept his cool with a stoppage time penalty to earn Aberdeen a point against Celtic in the SPFL on Monday (AEDT).