Early years / Zaragoza
Valentín Alsina, Buenos Aires, López began his career with local
Club Atlético Independiente in 1991. He won four major titles with the club during his spell, all arriving in his last years.
In January 1996 López moved to Spain with
Real Zaragoza, for a club record 420 million
pesetas, making his
La Liga debut on the 7th in a 1–1 home draw against
Rayo Vallecano. He scored five goals in 32 games in
his third full season, helping the
Aragonese to the ninth position in the table; during most of his stint with the club, he partnered countryman
López rejoined former Zaragoza manager
Víctor Fernández at
Celta de Vigo in the 1999 summer, and quickly became an essential first-team unit. He netted twice in five appearances in
the 2000–01 edition of the
Copa del Rey, helping the side to
the final against his former club (1–3 loss in
Seville), then contributed with 33 matches (29 starts, 2.232 minutes of action) in the
2002–03 campaign as the
Galicians finished fourth and
qualified for the
UEFA Champions League for the first time in their history.
At the end of
2006–07, after having suffered his second relegation with Celta and having already renewed his contract twice by reducing his wages, 34-year-old López decided to leave the club, amassing official totals of 292 games and 29 goals.
 He retired at the end of
the following season, also dropping down a level with
Cádiz CF, in
 then worked as commentator for
Canal+ on their coverage of the
Argentine Primera División, as well as running training camps for children.