The long-serving Spurs defender leaves the club after nearly 10 years on an undisclosed fee, with the north Londoners keen to stress that he will "always be welcome" at White Hart Lane.
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"I would like to say thank you to everyone at the club, including the supporters.”
"We have enjoyed some incredible moments together and I hope the club continues to move forward in the future."
Spurs chairman Daniel Levy added: "Michael has been an outstanding club representative both on and off the field.
"He has always given everything for the Spurs shirt - just one of the reasons he is so deservedly popular throughout the club."
Dawson, now 30, made 236 Premier League appearances for Tottenham since joining the club from Nottingham Forest in January 2005.