The 22-year-old was named in the Championship team of the season after the Clarets had conceded just 16 goals in 46 games, a league record. The appeal of a Premier League campaign, and a "significant long-term contract" was insufficient for Burnley to hold onto the player.
Egan-Riley started his career with Manchester City's academy, earning his first professional appearances for the club in the 2021/22 season. After his move to Burnley, loan spells with Hibs and Jong PSV in the Netherlands followed. Last season was Egan-Riley's first extended run of games in the first team, appearing in 49 games across all competitions.
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WHAT NEXT FOR MARSEILLE
The youngster is joining a club on the up. Marseille ended last term in ferocious form, finishing second in Ligue 1. The pull of Champions League football proved too strong compared to a fierce relegation battle had he remained in with Scott Parker's side.