Mark Noble will become West Ham's sporting director at the start of next year.
The former midfielder, 35, who spent his entire 18-year career with the Hammers, will take up a position that has been newly-created.
His remit will include supporting manager David Moyes, working with the club's board of directors and matters such as academy development, player recruitment and staff wellbeing.
Noble said: 'I'm really happy to be coming back and can't wait to get started. I'd like to thank the Club for giving me the opportunity – it's a great honour for me to take up this role at West Ham United.