SPAL Thiam started playing for the Under-19 squad of
SPAL in the 2016–17 season and made two bench appearances for the senior squad in the
Serie B.
Loan to Fano On 17 July 2017, he was loaned to
Serie C club
Fano. He remained Fano's first-choice goalkeeper for the remainder of the season.
Return to SPAL and loan to Viterbese Castrense Thiam was the third goalkeeper for the first part of the
2018–19 Serie A season, but did not see any playing time behind
Alfred Gomis and
Vanja Milinković-Savić. On 9 January 2019, he returned to Serie C on another loan, to
Viterbese Castrense. He came back to SPAL at the end of loan, and he made his Serie A debut in a 1–1 home draw against Torino on 26 July 2020. In September 2022, Thiam renewed his contract with the club until 2025.
Loan to Foggia On 31 January 2023, he joined
Foggia on loan until the end of the season.
Loan to Juve Stabia On 20 July 2023, Thiam moved on loan to
Juve Stabia. After winning promotion to Serie B with the Campanians, his loan was renewed for the 2024–25 season, this time with an option to buy.
Monza On 8 July 2025, he signed with Serie B club
Monza. ==Personal life==