Valladolid boss Juan Ignacio Martinez claims trying to beat Barcelona is like taking on sprinter Usain Bolt at the Olympic Games.
The Liga champions play host to the Pucela on Saturday with a 100 per cent record in this season's Primera Division, and the 49-year-old is in no doubt as to the task at hand for his players this weekend.
"These games are marked in the calendar with a lot of excitement," he told a press conference.
"Things have been very difficult. I don't want to be pessimistic, but this is like going to the Olympics to face Usain Bolt. You have to face the challenge.
"We're a team that has to try things. We must express our personality with the ball; although it will be difficult with the pressure they put you under in every area [of the pitch]."
Lionel Messi is ruled out of the match with a thigh injury but Martinez believes Neymar is more than capable of filling the creative void left by the Argentine.
"They have plenty of alternatives, including Neymar, who gives the kind of thing which the Argentine brings. Messi is the best in the world and can make a difference, even when injured."