sentences:  A product of Sevilla FC's youth system, he made his first-team debut on 21 December 2005 in a 0–1 away defeat against Getafe CF, appearing in two more La Liga games during the season while still registered with the B-side.In the 2007–08 campaign, with Antonio Puerta's (who played mostly as left back) death, Crespo was definitely promoted to the main squad.In December 2008, Aston Villa reportedly showed interest in signing him after several good performances under coach Manolo Jiménez, also his coach at Sevilla Atlético.