The 20-year-old talent, who has made nine appearances for The Rooks, joined Chelsea stars at their Cobham training base on Wednesday.
Darren Freeman’s side picked up the midfield maestro from Farnborough in October and he went onto to net just once for the club.
El-Mhanni, who has been a member of the AG Football Academy for the past three years, has also trialled with Premier League sides West Brom and Crystal Palace.
Leicester City and Norwich are reported to be interested as the former Lewes man looks to secure a professional deal.
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