 Riganò akabatana neFlorentia Viola yeSerie C2 muna 2002, uye akarova rekodhi rake rezvinangwa makumi matatu mumitambo makumi matatu nemaviri, achiwana zita remutambi wepamusoro-soro muligi zvakare uye achibatsira Fiorentina kuwana kukwidziridzwa. Mumwaka wa2003-04, akarova zvibodzwa makumi maviri nezvitatu muSerie B mumitambo makumi mana nemana, achibatsira Fiorentina kuhwina kukwidziridzwa kuSerie A uye kuwana rake Serie A kutanga aine makore makumi matatu mwaka unotevera. Munguva yechando yekuchinjisa hwindo ra2005-06, akakweretwa kuEmpoli nekubudirira kushoma. 