Nélson Augusto Tomar Marcos (born 10 June 1983), known simply as Nélson, is a Portuguese professional footballer who plays for Spanish club AD Alcorcón as a right back.After making a name for himself at Benfica, appearing in 107 official games during three seasons, he went on to spend the vast majority of his career in Spain, representing Betis, Osasuna and Almería.