Keane joined Spurs from Leeds in August 2002 for £7million.
He said: “I have felt really settled and happy at Spurs and that is probably one of the reasons I have played the best football of my career here.
“It is an exciting time to be at the club and I am looking forward to even better seasons ahead.”
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The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.
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