The Scotland international has moved to Tannadice on season-long loan.
The Dundee United defender will not face an SFA charge over a tackle that left Morelos injured.
The SPFL have announced the fixture list for the coming season.
Lord Clark ruled that the dispute over relegation should be dealt with by an SFA -convened panel.
The Scotland captain is an English league champion after Liverpool topped the table.
The Celtic boss says sport is secondary to the human cost of coronavirus.