The Croatian edged out competition from Marcelo Bielsa to sign a three-year contract at Upton Park, where he enjoyed an 18-month spell as a player in the mid-1990s.
West Ham has appointed Slaven Bilic as the club's new manager on a three-year deal with the Croatian replacing the departed Sam Allardyce at Upton Park.
Goal UK reports Bilic edged out competition from Marcelo Bielsa with both candidates having impressed co-owners David Sullivan and David Gold.
“I’m really glad to be back with West Ham United,” Bilic said. “It’s in the Premier League, which is among the best in the world.