Born in
Pontremoli, at club youth level, Albertosi represented the
Spezia youth academy for a season, before making his debut in
Serie A at the age of 18 for
Fiorentina on 18 January 1959, playing in a goalless draw with
A.S. Roma. Despite heavy competition from
Giuliano Sarti during his first five seasons at the Tuscan club, where he initially mainly served as a back-up, Albertosi represented Fiorentina until 1968, winning a
Mitropa Cup in 1966, a
European Cup Winners' Cup in
1961 (the first ever edition of the competition), and 2
Coppa Italia trophies in 1961 and 1966. He later transferred to
Luigi Riva's side,
Cagliari Calcio, where he helped to win Cagliari's legendary first and only
Scudetto during the
1969–70 season, his second season with the Sardinian club, recording what was at the time the lowest number of goals conceded in a 16-team Serie A campaign. He later transferred to
A.C. Milan in 1974, where he remained for six years, and he won yet another
Serie A championship medal with the club during the
1978–79 season, along with another Coppa Italia during the
1976–77 season. With 233 appearances for the club, he is Milan's fifth-most capped keeper of all time, behind only
Christian Abbiati (380),
Sebastiano Rossi (330),
Dida (302), and
Lorenzo Buffon (300). during the
1974–75 season. Albertosi was involved with the Italian "
Totonero" betting scandal of 1980 and was ultimately suspended for 2 seasons. After Italy won the
1982 World Cup in Spain, the Italian football federation decided to let him play again. He ended his career in 1984, after playing two seasons with
Elpidiense in
Serie C2, at the age of 44. ==International career==