Nieves has a disability: he has only some eyesight. He lost his eyesight when he was 17 years old. It happened very fast and was a surprise. It is not understood what caused it or if his eyesight will continue to get worse. Before losing his eyesight, he played football as a midfielder for Sárdoma in Spain's División de Honor Juvenil de Fútbol, and had tried out for Celta de Vigo football team. He quit the sport after his eyesight got bad.