The Chilean, who guided City to the 2014 Premier League title, has left his role at Hebei China Fortune to take over at the Premier League club
West Ham United confirm former Manchester City manager Manuel Pellegrini as replacement for David Moyes
West Ham United announced former Real Madrid and Manchester City boss Manuel Pellegrini as their new manager on Tuesday, replacing David Moyes at the helm of the Premier League club.
The 64-year-old Chilean left his role with Hebei China Fortune over the weekend and flew to London for talks.
The Hammers opted not to keep Moyes on after the Scot's short-term contract ended following the final game of the Premier League season - a 3-1 win over his former side Everton that saw them finish 13th.
Joint chairman David Sullivan hailed Pellegrini's track record of winning the Premier League title with City as crucial to his chances of ushering in a new era of success at the London Stadium.
"I am delighted to welcome Manuel Pellegrini to West Ham United," Sullivan said on the club's website. "He is one of the world's most respected football coaches and we look forward to working with him.
"It was important that we appointed someone with knowledge and experience of the Premier League, who already has an understanding - not only of the teams and players we face - but of West Ham United and our ambitions.
"Manuel brings a reputation for attacking football and getting the best out of his players. We believe he will attract new talent to the London Stadium as well as improving the current squad."
Pellegrini coached at Villarreal, Real Madrid and Malaga in Spain before taking charge of Manchester City in 2013, going on to win the 2013/14 Premier League title as well as the League Cup twice before his departure.
He left the Etihad Stadium in June 2016, to be succeeded by Pep Guardiola, but was soon back in work at Hebei.
Despite being under contract through to the end of 2018 and with a reported release clause of US$7 million (Dh25.7m), Hebei confirmed on Saturday that Pellegrini had left his role.