The Argentina international has been placed on the transfer-list by United as they seek buyers for the defender.
Ole says Juan Veron''s Estudiantes have been in contact about bringing the 29 year-old back to his old club.
The stumbling block is Rojo's wages, with the defender tied to United until 2021.
A compromise, howwever, could involve United paying a percentage of Rojo's remaining contract.
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