Career
A much-travelled defender, Alonso made his league debut with Football Club Chinandega in 1996 and played for several Nicaraguan league clubs in a career spanning over 15 years. His clubs include Walter Ferretti, Real Estelí, Parmalat and Diriangén. In summer 2006 he joined Scorpión after just winning the league with Diriangén.
In January 2010 he left VCP Chinandega and returned to Estelí, only to sign with América in November 2010.
Alonso made his debut for Nicaragua in a March 2000 World Cup qualification match against El Salvador and has earned a total of 37 caps, scoring no goals. He also has been national team captain.
His final international was a September 2010 friendly match against Guatemala.