The second leg of the play-off between Rangers and PSV will be played without Morelos.
The player was left out of the travelling party due to his fitness and attitude.
The decision is believed to be supported by senior players.
Morelos was sent off in the game at Easter Road.
He was red-carded 13 minutes into the game after coming off the bench after recovering from an injury.
There was a red card shown to John Lundstram, but not to Morelos.
The Rangers and the Dutch side played to a 2-2 draw in the first leg.