The two clubs issued a joint statement on Thursday in which they stated any supporter involved in discrimination in the stands would be ejected from the stadium, with further criminal sanctions also possible.
Recent fixtures between the two have been marred by unsavoury references to the Munich and Hillsborough tragedies, and United boss Mourinho has stated he will be upset if there is a repeat of those type of incidents in the latest instalment of the two teams' rivalry.
"In football we have some football tragedies, if you can say that, which is a big match that you lost, the mistake that some player did, this kind of thing, and you can make fun of it in a positive way," the Portuguese said.
"But the human tragedy is something much more serious
It's the last thing somebody should use in a football pitch because they were really big tragedies, not to forget but to respect
I will be really sad in such a big football match if that was a negative point."
Source : PA
Source: PA