Carvajal says the decision to take the game to a neutral location "distorts" the competition.
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He told RTVE: "A clear distortion of the competition.
"Not all clubs compete under the same conditions.
"It's essential that players, clubs, and the league work together to create fairer football, but that's not the case at the moment."
Carvajal also spoke of the El Clasico against Barcelona this weekend.
He said, "It's only three points, but facing our main rival is always special. Winning would boost our confidence, let's hope we can do that."
