The 29-year-old has found himself behind Emmanuel Adebayor as Harry Redknapp’s first-choice striker, starting just seven Premier League matches so far this season.
Defoe has been linked with a move to Liverpool but he has denied that he wants to leave north London.
He told Sky Sports News: "At the end of the day it's not a case of me saying I want to go here, I'm not playing, I want to leave the club.
"I've been here six years, I've never said that once. I think the fans know that.
"It's just a case of me playing. I could understand if I was 19, 20 and I had time on my hands but I'm 29 now and, like I've always said, all I want to do is play football. It's as simple as that."
Defoe is almost certain to feature against Manchester City with Adebayor ineligible to play against his parent club, and he insists that he will be ready to go should he be selected.
"As it stands I'm a Tottenham player and if I do play against Manchester City I'll be fully committed. I'm sure everyone knows that at the club," he said.
Should Spurs win on Sunday they will close the gap on first place City as they seek their first league title since 1961 and like his manager, Defoe believes anything is possible with the way they are playing.
"I'm going to say what the manager says - it's not impossible," he added.
"I think when you really believe anything is possible.
"The way we're playing is fantastic. The chances we're creating, the intensity we're playing at, the way we move the ball; it's just been great.
"It's a good time to be at the club, everyone is enjoying it."
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