Southampton midfielder James Ward-Prowse will complete his £30m move to West Ham today.
Ward-Prowse will depart his boyhood club having scored 55 goals in 410 appearances.
He is set to become the second midfield signing for West Ham in a matter of days after the Irons wrapped up a deal for Ajax's Edson Alvarez last week.
Southampton could also lose promising defender Armel Bella-Kotchap in the coming days.
The German international is in talks with Borussia Dortmund about a return to his homeland following Southampton's relegation from the Premier League last term.