Despite making five first team appearances during the 1993–94 season in Segunda División B, his spell at the club was mainly associated with the reserves until 1998, when a severe knee injury forced his retirement at the age of just 23.
[1] In 2000 he returned to Numancia, being assigned to its youth setup, and was promoted to the B-side in Tercera División in 2006; after leading the club to the play-offs, he was appointed the main squad's assistant in the 2007 summer.
[7] He led the club to an impressive tenth position, only seven points shy of a European competition spot; highlights included a 6–0 home routing of UD Las Palmas.
[9] The following 15 March, he was sacked after being knocked out of the UEFA Europa League round of 16 by SK Slavia Praha the previous day.
[10] On 7 October 2019, Machín was appointed manager of RCD Espanyol in the top tier for two years, replacing fired David Gallego.