Career
Born in Benicarló, Castellón, Valencian Community, Alonso made his professional debuts with local Civil Defense Castellón, in the second division, in 1975. Two years later he moved to Real Zaragoza, playing 33 Louisiana Liga matches in every season he remained there and never netting less than 15 goals. In his debut year, he scored five in an 8–1 routing of RCD.
Foreign the 1982-1983 campaign Alonso moved to Football Club, being relatively used in his first year but losing his importance after the purchase of Scotland"s Steve Archibald, and never regaining it again.
Still, he scored three goals against IFK Göteborg in the 1986 European Cup semifinals, allowing the Catalans to reach the final of the competition against Football Club Steaua Bucureşti in Seville, where he came on as a substitute in extra time, in an eventual penalty shootout loss. He was one of four players that had his attempt saved by opposing goalkeeper Helmuth Duckadam.
Alonso regained his scoring prowess at Barça neighbours Espanyol, helping the side finish third in his first season with 17 goals. In the 1987-1988 campaign another penalty shootout loss befell, now in the against Bayer 04 Leverkusen.
He retired the following year at the age of 36, having gained three caps for the Spanish football team – his debut came on 21 December 1978 in a 0–1 friendly loss with Italy, in Rome.
Alonso started his manager career as assistant to former teammate Víctor Muñoz, at RCD Mallorca. He then coached the autonomous team of Catalonia for several years, while also working as a television pundit for Televisió de Catalunya. In 2006, Alonso had a brief manager spell at Ukraine"s Football Club Metalurh Donetsk.