Francisco Gabriel Guerrero (born 23 August 1977, in Buenos Aires) is an Argentine former football player who played as striker.

[1] The club were looking for replacements for the two Swiss internationals Marco Streller and Hakan Yakin who both transferred to VfB Stuttgart.

Guerrero was the fourth Argentinian in the team, joining Christian Giménez, Matías Delgado and Julio Hernán Rossi.

Guerrero played his domestic league debut for the club in the away game in the Stadion Neufeld on 15 February 2004 as Basel won 1–0 against Young Boys.

Basel ended the season undefeated at home, but were beaten three times away, nevertheless they won the championship with 13 points advantage over their nearest rivals Young Boys.