 In his sole season in La Liga, which started in January 1998, having been signed from San Lorenzo de Almagro, Abreu scored for the Galicians in a 3–1 home defeat of FC Barcelona on 25 January.After having joined Mexico's Tigres de la UANL in 2007, Abreu was able to rescind his contract with them in order to join Club Atlético River Plate – the Mexican Football Federation stalled on recognizing the transfer because of an imposed moratorium between the clubs.With Tigres he became the only foreigner to score in the "Clasico Regio" (Tigres vs. C.F.