The 31-year old Republic of Ireland captain has joined the MLS club as one of the Galaxyâ€™s three Designated Players on a two-year deal, alongside former Manchester United star David Beckham and USA international Landon Donovan.
The initial fee is believed to be worth around $US3.6million (ÂŁ2.2m) which could rise depending on contract conditions agreed upon by Spurs and the Galaxy.
â€śI am delighted, honoured and very excited to be joining the LA Galaxy,â€ť Keane said. â€śI have always wanted to come and play in MLS so itâ€™s the perfect combination for me and a dream come true.
â€śMy family and I have already been made to feel very welcome in telephone calls from Tim Leiweke and (Galaxy manager) Bruce Arena.
â€śAlso when David Beckham came and trained at Spurs recently he couldn't speak highly enough about the Galaxy, their fans and the league in general, so I canâ€™t wait to get over and get started.â€ť