Foul behaviour has been condemned in a warning to Leeds United supporters from chief executive Angus Kinnear.
Writing in his Elland Road programme notes, Kinnear hoped the home crowd would play a major role in turning the tide to United’s advantage, but hoped this would not overstep the mark.
“As ever the Elland Road crowd will play a huge part and if we can recreate the cauldron of support we have enjoyed for our most important fixtures under Marcelo’s reign, I am confident it will be the deciding factor,” he said.
“While the hostility of Elland Road is a definite competitive advantage we would all encourage, let’s not mistake it for unsavoury and illegal behaviour that could mar our reputation and it is not befitting of our treat club or city.
“The eyes of the world are on our match today so let’s take it as an opportunity to show everything that makes our club great both on and off the field.”
Kick-off at Elland Road is 2pm.