On 10 February 2017, Sylla signed his first professional contract with Monaco keeping him at the club until June 2020.[2] He made his professional debut for Monaco in a 3–1 Ligue 1 loss to Guingamp on 21 April 2018.[3]
He scored his first professional goals on his first start on 6 May 2018, finding the back of the net both times in a 2–1 away victory against Caen in Ligue 1.[4]
He was released from Monaco upon the expiration of his contract at the end of the 2019–20 Ligue 1 season.[5]
FC Utrecht
On 15 September 2020, Sylla signed a three-year contract with Eredivisie side FC Utrecht, with an option to extend the contract until 2024.[6] On 25 September 2021, he scores his second goal of the season against PEC Zwolle.[7]
Caen
On 31 January 2023, Sylla joined Ligue 2 club Caen on a two-and-a-half-year contract.[8]
Pau
On 8 August 2023, Sylla was loaned to Pau for the 2023–24 season.[9] Pau activated an option to buy for €300,000 at the end of the season. However, Sylla was immediately transferred to Schalke 04 for a reported fee of €2,5 million.[10]
Born in France, Sylla is of Malian descent. A former youth international for France, he was called up to the Mali national team for a set of friendlies in March 2024.[12] He made his debut on 22 March, coming on as a substitute in a 2–0 home win over Mauritania.[13]