By Alberto Pinero
Former referee Raul Garcia de Loza has insisted that officiating a game between Barcelona and Real Madrid is more difficult than leading any other game.
The 65-year-old feels that being the man in charge for a Clasico is something special, and added that a referee needs personality in order to keep everything under control.
"It is very special to be awarded a Clasico. Everybody who claims differently is lying. You can't address a Clasico like any other game. It's very hard to be the referee in these games. Nobody makes life easy for you," Garcia de Loza said to Goal.com.
"The matches between Real Madrid and Barcelona were more important than any other match for me. Officiating a Clasico is more important and difficult than for example, a Champions League semi-final.
"You have to be a top arbiter in order to referee a Clasico and need personality. It's vital not to get involved in what others say. It is not important what [Jose] Mourinho says, and neither are [Pep] Guardiola's words."
Encounters between Barcelona and Real Madrid led to plenty of controversy earlier this year, but Garcia de Loza insists that referees always attempt to finish the match without any dismissals.
"The objective is always to finish with 22 players on the pitch. You have to realise that not all the players are the same when you prepare for the game. Some have a more aggressive approach than others. You have to decide for yourself where the boundaries are."
Saturday's Clasico at Camp Nou kicks off at 20.00CET.
Goal.com will be hosting a LIVE Twitter Q&A on Friday at 14:00BST as Goal.com Spain Editor Martin del Palacio Langer and Goal.com International Features Editor Carlo Garganese debate whether Lionel Messi and Cristiano Ronaldo are the two greatest players of all time. Throughout the LIVE we want to hear your thoughts and opinions on the subject, while we will also be putting your questions to Martin and Carlo as we look to bring the debate to an end.