Chelsea signing Cesc Fabregas is in a cash row with former club Barcelona.
Marca says Cesc is due 5 million loyalty bonus courtesy of his deal with Barca, but the Catalans are refusing to pay.
Barca told the midfielder he would be repaid should he ever sign for another team.
However, they are thought to have warned the 27-year-old if the deal was made public they would flatly deny the clause.
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