"FC Barcelona expresses its rejection and indignation at the content of the tweet published by the president of Malaga, Abdullah Al-Thani, which is counter to the principles of fair-play, ethics and legality," said the Spanish champions in a statement.
Al-Thani had responded to a message on Twitter from a Barcelona fan asking his club to do them a favour by beating Real Madrid on the last day of the season.
"God willing they (Real) will be flogged on the pitch. But the scum of Catalonia will not smell the league (title) after the lies they made up about coach Michel," said the Qatari sheikh.
Michel himself had said he'd rather provide Real with a "guard of honour" than a "blow" when the European champions visit the Rosaleda on the final day of the season.
However, he added: "But I'm a winner and I hope that before the final day everything is decided."
Eternal rivals Real and Barca are level on points with less than a month of the season left.
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