Education
In June 2012 Vassallo graduated from the reserve team and left for the fourth division club Foligno in co-ownership deal along with Andrea Adamo for a peppercorn of €500 each.
In June 2012 Vassallo graduated from the reserve team and left for the fourth division club Foligno in co-ownership deal along with Andrea Adamo for a peppercorn of €500 each.
Vassallo started his career at Palermo. Vassallo made his professional debut in Lega Pro cup. On 31 August 2012 Adamo was sold outright for €14,667 in exchange with the 50% rights of Vassallo for €500.
However Vassallo also returned to Foligno in temporary deal for €1,000 with a new pre-set price.
Palermo also subsidized Foligno €14,667 as performance bonus (Italian: premi di valorizzazione). Thus, Foligno got Adamo for a peppercorn of €1,000 Netto as a rewards to sell first team place to inexperienced Vassallo.
On 11 July 2013 he moved on loan to the third division club Südtirol, located in the autonomous province of the same name. Vassallo was the starting midfielder in the cup as well as in the league, despite he was a sub for Branca in the first round.
On 9 July 2014 he was signed by Pistoiese.
International career
Vassallo had played for the Italy U19 and Italy U20 youth selections.