Born in the
Valencian town of
Alicante on 20 August 1882, Lassaletta began his career at FC Barcelona in 1901, aged 19, making his official debut with the first team on 19 January 1902, in a
Copa Macaya match against
Espanyol, helping his side to a 4–0 win. Later that year, he was member of the Barcelona second team that won lesser tournaments organized by the
Spanish Gymnastics Federation, such as the
1902 Medalla del Ayuntamiento between February and June 1902. In June 1902, the journalists of the Spanish newspaper
Los Deportes described him as a 19-year-old who "distinguished himself with his strong footwork and determination to score". On 1 May 1904, Lassaletta was a member of Barça's first-ever trip abroad, starting in a
friendly match against Stade Olympien des Etudiants de Toulouse (SOET) in
Toulouse, scoring once in a 3–2 win. In total, he scored 78 goals in just 59 matches for Barça, of which 19 goals came in 22 official matches. ==Professional career==