Aston Villa, Brighton and Manchester City are all watching El Hilali this season, says Mundo Deportivo.
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El Hilali played a key role with Espanyol in last season's promotion winning campaign and has impressed this term in the Primera.
He has a contract to 2027, which carries a €15m buyout clause.
El Hilali, 21, made his debut for Espanyol as a 17 year-old.