Max Kilman will leave a hole in the Wolves defence, having been integral to the side's resilience in recent years.
Kilman played every minute of all 38 Premier League games last season, with William Saliba of Arsenal the only other outfield player to achieve the feat.
However, now it will be West Ham who benefit from his reliability, his £40m move reuniting him with former Molineux boss Julen Lopetegui, who made him captain while Wolves head coach.
Wolves have plans in place and were prepared for this eventuality, though.
It is a huge fee for a 27-year-old who cost just £40,000 from Maidenhead in 2018 and represents a stunning deal for the club.