Ibrox boss Giovanni van Bronckhorst confirmed the Colombian is out of the top-of-the-table clash at Ibrox.
Speaking ahead of Sunday's fixture, which could go some way to deciding the destination of the league title with Rangers trailing their rivals by three points, the Dutchman revealed they could miss him for the Europa League clash with Braga.
“Morelos will be assessed and hopefully we can give more news after the weekend,” he said.
"Unfortunately for all of us he won't be with us on Sunday, we won’t have him back in the next couple of weeks.
Morelos was pictured at Glasgow airport on crutches, reportedly on the way to London to see a specialist.
He had been with the Colombia squad for their crucial qualifying double header with Bolivia and Venezuela. However, he played not part as the team failed to reach the World Cup.