Sampdoria Born in
Genoa, Fiorillo started playing football in Nuova Oregina Calcio from the Oregina neighborhood of Genoa. In 2004, he was transferred to local
Serie A side,
U.C. Sampdoria. He remained within Sampdoria's youth ranks for 5 years, and on 10 April 2008 he was part of the first ever
Sampdoria Primavera squad to win the
Coppa Italia Primavera. In the final he saved two of four penalties in the shootout against Atalanta, thus securing victory for
Blucerchiati. He also won the first ever
Campionato Nazionale Primavera for Sampdoria, after he finished as the runner-up with the club in the 2007 edition. Originally considered a rising star, being even compared to
Gianluigi Buffon, Fiorillo made his Serie A debut on 13 April 2008, against
Reggina. He remained with Sampdoria for the start of the
2009–10 Serie A campaign, but on 13 January 2010, he was sent on loan to
Reggina in an exchange deal for goalkeeper
Mario Cassano. After making 5
Serie B appearances for the
amaranto Fiorillo returned to Sampdoria on 30 June 2010, upon the expiration of his loan deal. In January 2011 he left
Genoa once again for another 6-month loan to another
Ligurian club
Spezia, where he appeared in 8 league matches during the second half of the
2010–11 Lega Pro Prima Divisione. After returning to Sampdoria once more, he was successively loaned out again on 4 August 2011– this time to
Livorno in the Serie B. With the
Tuscan outfit, Fiorillo finally managed to win a first team spot thanks to his impressive performances that were fundamental in his club's ultimate promotion to Serie A following their promotion play-off victory. After 28 league appearances for Livorno, he returned to Sampdoria at the end of his loan spell, remaining as the second-choice keeper to
Angelo da Costa Júnior.
Juventus In January 2014, Fiorillo was involved in a co-ownership player-exchange deal with 50% of his contract being sold to
reigning Serie A champions,
Juventus in exchange for 50% of the contractual rights of Juventus'
Stefano Beltrame. Both 50% rights were valued for €2 million. As part of the deal, Fiorillo remained with Sampdoria on a six-month temporary loan deal, and Beltrame returned to Bari, with whom he was previously on loan with from Juventus. On 19 June 2014, Juventus and Sampdoria renewed the co-ownership agreement of the player, with Juventus holding the registration rights of the goalkeeper. On 30 June 2014, Fiorillo moved to Juventus upon the expiration of the loan agreement.
Pescara (loan) On 23 July 2014, it was officially communicated that Fiorillo signed for
Serie B side
Pescara on a season-long loan deal along with teammate
Gabriel Appelt. Fiorillo wore number 1 shirt for their first team. In June 2015 Juventus acquired Fiorillo outright from Sampdoria for free; Beltrame also returned to Juve in January 2015 in a pure player swap. On 23 July 2015, Fiorillo returned to Pescara in a temporary deal, with an option to purchase, which would become an obligation if Pescara promoted to
2016–17 Serie A. Fiorillo kept his number 1 shirt for the new season.
Pescara After Pescara activated the conditional obligation to buy Fiorillo outright in summer 2016 for €2 million, he remained in Pescara for their
2016–17 Serie A campaign. However, he was the backup of former Argentine internationals
Albano Bizzarri instead.
Carrarese On 31 January 2025, Fiorillo moved on loan to
Carrarese. On 15 July 2025, he returned to Carrarese on a permanent basis. ==International career==