Real Madrid coach Carlo Ancelotti has said his side will "play attacking football, without taking risks" during Sunday's LaLiga Clasico.
Barca head into Sunday's league game nine points clear of eternal rivals Real Madrid with 13 games remaining.
Madrid are chasing three competitions, going into Sunday's LaLiga Clasico nine points behind leaders Barcelona, preparing to face Chelsea in the Champions League quarterfinals and hoping to turn around a 1-0 first-leg deficit in their Copa del Rey semifinal with Barca.
"It's difficult to say what game we'll get [on Sunday]," Ancelotti said.
"Barcelona defended a lot in that game, because they went ahead. This game will be different depending if we score early, or they do... Tomorrow we'll play attacking football, without taking risks."
Ancelotti is "convinced" that Madrid will win a major trophy this season but the key duel in that Copa game saw Barca defender Ronald Araujo, who was playing at right-back, come out on top against Vinicius Junior.
"It's true that it's been more difficult for him," Ancelotti said. "But Vinicius is always Vinicius. His mobility can help him. I'm thinking about putting him on the right... Obviously I'm not being serious, but mobility is important."
Barca can move 12 points clear at the top of LaLiga with a win, but the build-up to the Clasico has revolved around a referee corruption scandal in which it is reported that €7 million was paid to the former vice president of the refereeing committee, Jose Maria Enriquez Negreira.
A Spanish court earlier this week agreed to open an investigation into allegations of corruption against Barca following the revelation of payments made to the former vice president of the refereeing committee.
Barcelona midfielder Pedri – out of action since sustaining the injury on his right leg in a 2-2 draw against Manchester United in the Europa League clash on February 16 – is likely to miss Sunday's LaLiga Clasico against Real Madrid with a hamstring problem.