Barcelona and Athletic Bilbao have both asked for this season's Copa del Rey final to be at Real Madrid's Bernabeu.
The game, to be played on 30 May, does not have a set venue - and Madrid had not applied to host this one.
Last year's final was at Valencia's Mestalla as Real beat Barca 2-1.
"Since both clubs wish to play the final at the Bernabeu, we made a formal request to Real Madrid and will be waiting for an official response," Barca director Albert Soler said.
"The Spanish Federation had received requests from some cities to host the cup, but not from Madrid."
Both clubs have chosen Bernabeu so they can have the maximum number of tickets available, and say they have not considered any alternatives.