Real included Denis Cheryshev in their starting lineup for the match and the Russia forward opened the scoring in his side's 3-1 victory, even though he should have been serving a one match suspension.
Cadena Ser, which did not identify the source of its information, said the Spanish soccer federation (RFEF) had told Cadiz of the decision to expel Real, who had said they would appeal if they were thrown out of the competition.
The RFEF was expected to announce its decision later yesterday.
Cheryshev earned a third yellow card, which carries an automatic one-game ban, playing on loan at Villarreal in last season's Cup.

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