The 31-year-old hasn't featured for Roberto Mancini since September 2011 and spent the latter half of last season on loan at SunderlandManchester City defender Wayne Bridge has moved to Championship side Brighton on a season-long loan deal.
The left-back, who has not featured for City since last September, was loaned out to Sunderland in January and subsequently made 10 appearances for Martin O'Neill's side.
The 31-year-old was signed by Mark Hughes in January 2009 for £10 million but was marginalised at City following the arrival of Roberto Mancini.
"It's difficult to say how happy I am because it's not easy to get top-class players. I'm absolutely delighted to have Wayne with us. He's been one of the top three left-backs in this country for many years," Brighton boss Gus Poyet told reporters.
"There were a lot of things that had to come together to make it happen. Firstly, David Platt has been great at Manchester City and then Wayne and his agent have helped a lot too.
"It was not an easy one to secure, but this is what we want at this club. He's a quality player with lots of international experience.
"Wayne has played at the top of English football for a long time. We have all got to learn from him and I'm sure that he will have a very good season with us. It's going to be very nice to sit back and watch him on the pitch."