Internacional are angry over Sunderland's approach for Ignacio Scocco.
The Mirror says Gus Poyet has confirmed his interest in the versatile 28-year-old attacking midfielder or forward.
And the Black Cats boss has used his Spanish to try and broker a deal.
But the Brazilian club, who want £6.5m or $10m for their Argentine international, are angry at his hands-on approach.
Reports in Brazil now claim Internacional may sell to rival bidders.
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