The 24-year old Argentine defender, currently with Atletico Tigre, is the subject of official interest from the Black Cats which he is certainly aware of says his representative Filippo Colasanto.
"Sunderland have moved in a concrete and correct way for Orban, making an offer to the player's family," he told tuttomercatoweb.
"We talked about it, but the boy wants to take his time and choose at the end of the Argentine championship.
"There are several opportunities for him in Spain, so the choice is between these two countries.
"He is physically very strong and he would be perfect for the Premier League."