The 30-year-old midfielder has expressed his desire to leave Upton Park following the side’s relegation to The Championship, and has moved to White Hart Lane for £5 million.
Parker will form an exciting central midfield partnership with Luka Modric, who remained at the north London club despite a last-gasp bid from Chelsea.
West Ham have bolstered their squad despite the loss of Parker by taking David Bentley and Arsenal youngster Henri Lansbury on loan until the end of the season.
Spurs fans will be happy with Parker’s addition, but Harry Redknapp’s side also missed out on another England international, as a £12 million bid for Gary Cahill was turned away by Bolton.
The former Aston Villa defender is in the last year of his contract at the Reebok stadium, but it is thought that boss Owen Coyle was holding out for £13 million, a figure that Spurs could not match.
The failure to lure Cahill from Bolton meant that Sebastien Bassong’s proposed move to Queens Park Rangers fell through, as Redknapp did not want to be left short at the back.