Southampton's Romeo Lavia is valued at £45m but the Saints could land more as Liverpool and Chelsea hover while Arsenal and Manchester United remain in the wings, waiting on their own departures.
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Chelsea are negotiating with Brighton over a potential £100m deal for Moises Caicedo, but if that becomes too difficult they would revert back to Lavia who they offered £50m for in January.
Liverpool are focusing on Lavia with his age, 19, and Premier League progression, key factors in their assessment as they build a younger side.