In 2002, Riganò joined Florentia Viola of Serie C2, and scored a personal record of 30 goals in 32 matches, earning the title of top-scorer in the league once again and helping Fiorentina to obtain promotion.

On 2 February 2009 Riganò accepted a permanent move to Cremonese, another Lega Pro Prima Divisione club,[10] where he re-joined Emiliano Mondonico, his former head coach at Fiorentina.

[11] He successively left Cremonese at the end of the season, and signed with Italian club San Frediano Rondinella S.S., the second team of Florence.

[1][4][7] A large and tall striker who excelled in the air, Riganò was neither fast nor particularly powerful, but was known for his opportunism, anticipation, heading accuracy and eye for goal, despite his poor work-rate and struggles with fitness and weight-gain in his later career; due to his prolific goalscoring and place of birth, he earned the nicknames il bomber di Lipari and Riga-Gol.

[2][7] A former defender, he was a well-rounded forward, who possessed excellent movement, timing, and positional sense, which made him a difficult player to mark.