Born in Paris, Sylla began his career with L'Entente SSG,[1] where he made over 100 appearances before signing with English club Oldham Athletic in January 2019.[2][3] He made his debut on 12 January 2019, in a League match against Forest Green Rovers.[4] He returned to France in June 2020 to sign for Laval.[5]
On 30 October 2021, Sylla joined National League side Aldershot Town,[6] and went onto score on his debut later that day, during a 2–1 away defeat to Barnet.[7] In the 2021–22 season, Sylla made 32 appearances in all competitions for Aldershot, scoring twice. Additionally, he also won the club's player of the year award.[8]
On 4 August 2022, Sylla signed a one-year deal at League Two club Hartlepool United.[9] On 1 January 2023, he scored his first goal for Hartlepool in a 3–3 draw with Harrogate Town.[10] He was dropped from the matchday squad for wins against Grimsby Town and Barrow with manager John Askey claiming that Sylla was not in the right frame of mind to play.[11] It was later reported by the Hartlepool Mail that it was believed Sylla refused to play in the game against Grimsby.[12] Following the win against Barrow which had left Hartlepool relegated, Askey said that several players had been dropped due to their attitude.[11][13] Despite this, Sylla's contract option was exercised to keep him at the club for a further year, although he failed to return to pre-season training with club.[12]