Christie escaped with only a free-kick against him after grabbing the Colombian in the groin area with his hand during Rangers’ 2-1 win at Celtic Park on December 29.
But he was subsequently charged with violent conduct by the Scottish Football Association and a fast-track tribunal found him guilty.
The 24-year-old had already been booked by referee Kevin Clancy for a foul on Morelos when he appeared to grab the striker after he had been nutmegged by the Colombian.
Christie will miss Celtic’s William Hill Scottish Cup clash with Partick Thistle on January 18 along with their Ladbrokes Premiership encounter at Kilmarnock four days later.
The ban triggers an extra one-match suspension because it is his second red-card offence of the season – he was sent off against Livingston – so he will also sit out the visit of Ross County on January 25.
The Scotland international is recovering from groin surgery and was rated ‘touch and go’ by assistant manager John Kennedy for the trip to Maryhill.