Genoa Ierardi was a youth product of
Geona youth team.
Loan to Ravenna On 1 July 2017, Ierardi was signed by
Serie C side
Ravenna on a season-long loan deal. On 10 September he made his Serie C debut for Ravenna as a substitute replacing
Riccardo Barzaghi in the 84th minute of a 5–1 home defeat against
Triestina. On 22 September, Ierardi played his first match as a starter for Ravenna, a 1–0 home win over
Modena, he was replaced after 81 minute. On 1 October he played his first entire match for Ravenna, a 1–0 away win over
Fano. Ierardi ended his season-long loan to Ravenna with only 14 appearances.
Loan to Südtirol On 13 July 2018, Ierardi was loaned to
Serie C club
Südtirol on a season-long loan deal. On 30 July he made his debut for Südtirol in a 2–1 home win over
Albalonga in the first round of
Coppa Italia, he played the entire match. On 5 August he played in the second round in a 1–0 away win over
Venezia. One week later he played in the third round, a 2–0 away win over
Frosinone. On 17 September he made his Serie C debut for Südtirol in a 1–0 home win over
Teramo, he played the entire match. On 26 December he was sent-off with a double yellow card in the 79th minute of a 1–1 away draw against
Monza. Ierardi ended his loan to Südtirol with 31 appearances. On 4 August he made his season debut for the club and he also scored his first professional goal in the 74th minute of a 4–1 home win over
Città di Fasano in the first round of
Coppa Italia, he played the entire match. Three weeks later, on 25 August, he made his league debut with a 2–1 away win over
Vis Pesaro, he played the entire match. On 21 September, Ierardi scored his first in Serie C in the 51st minute of a 1–0 away win over
Arzignano Valchiampo. On 22 January he scored his second goal for the club in the second minute of a 2–0 home win over
Vis Pesaro.
Vicenza On 18 August 2020, Ierardi joined to newly promoted
Serie B club
Vicenza on an undisclosed fee and he signed a 3-year contract.
Loan to Pescara On 26 January 2022, he was loaned to
Pescara.
Loan to Lecco On 31 January 2024, Ierardi was loaned by
Serie B club
Lecco, with an option to buy.
Catania On 16 July 2024, Ierardi signed a two-year contract with
Catania. == International career ==