Sunderland are in talks with Santiago Vergini, and Sky sources understand he is in the North East.
The Black Cats have been chasing the Argentine international for a number of weeks and they now seem to be progressing on the deal.
The 25-year-old is currently with Estudiantes, but they are ready to sanction a deal.
It is understood that Vergini will sign an initial deal until the end of the season.
Vergini will become Gus Poyet's second signing of the month, having already captured left-back Marcos Alonso on loan from Fiorentina.
Sunderland are hopeful of completing a number of deals during the January window and they are still very much interested in landing Brighton midfielder Liam Bridcutt.
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