Tonight's referee for the match between Inter Milan and Manchester United
, Luis Medina Cantalejo, is a mild mannered, unassuming man off the field but a strict disciplinarian on it and he will not be affected in the cauldron.
The players must do their best to follow his lead.
Ronaldo flicks out at David Dunn at Old Trafford on Saturday
Spaniard Cantalejo, who will be 45 this Sunday and is in his final season, will not take reputations into consideration and, given his wealth of experience in La Liga, will recognise and act strongly if his authority is brought into question.
More from Graham Poll. Graham Poll: Now for something completely different in World Cup year
20/02/09 Graham Poll: We all love the FA Cup's extra edge
13/02/09 Graham Poll: You should know better, Steve
08/02/09 Graham Poll: Where are all the young referees, as old guard head for final whistle?
06/02/09 Graham Poll: Riley in the wrong - Lampard red card must be rescinded
01/02/09 Clattenburg's career could have been saved if he had been a full-time referee
30/01/09 Graham Poll: Suspending referees doesn't help anyone
23/01/09 Graham Poll: Dowd was spot on with penalty and yellow card for Konchesky
19/01/09 VIEW FULL ARCHIVE
His style is to give lots of free kicks to take the sting out of a match and keep tempers in check - I hope it works.
The kind of petulant kick which Cristiano Ronaldo got away with against Blackburn on Saturday, if seen by Cantalejo, will not be acceptable and will more likely be deemed a red-card offence.
Wayne Rooney should also have learned that staying calm in Europe is essential, as UEFA referees will not be as tolerant as domestic officials.
Running scared: United will not be able to look us in the eye, goads Jose
Remember me? I knocked United out in 2004 and I'll do it again with Inter, goads mischievous Mourinho
O'Shea set to solve United's defensive crisis as Irish duo both board plane for Inter clash
Champions League lowdown: Previews of the week's big ties
MANCHESTER UNITED FC NEWS FROM ACROSS THE NET