 A product of Sevilla FC's youth system, Alfaro was one of Sevilla Atlético's most important players from 2005 onwards, helping them achieve promotion to Segunda División in the 2006–07 season.He had previously made his first-team debut on 30 April 2006, playing eight minutes in a 2–1 away win against Real Sociedad.Alfaro scored his first La Liga goal on 28 January 2007, as a starter in a 4–2 win at Levante UD, also appearing in four UEFA Cup games in the club's victorious campaign.