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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Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.
Newcastle United are staring down the barrel of relegation to the Championship for the second time in the past eight years.