Sylla has enjoyed spells with the Shots and Oldham Athletic in English football after spending a number of years in his native France with Entente SSG in the Championnat National and arrives at the Suit Direct Stadium having agreed a one-year deal with the club.
Sylla, 28, becomes Paul Hartley’s 14th summer signing and adds a further physical presence in midfield.
The Frenchman made 30 appearances in the National League last season after racking up over 50 appearances for the Latics during an 18-month spell.
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"I’m delighted to sign for Hartlepool United. I have played in the league before so I know how competitive it can be. I’m excited to get started and help the team as much as I can,” said Sylla.
Pools boss Hartley added: “He’s aggressive and strong. He adds height and plays forward. We’re looking forward to working with him.”