The 30-year-old is Spurs' longest serving player having come through the youth ranks at White Hart Lane but his contract is up at the end of the season.
And after managing just six games last term, King has been warned by Harry Redknapp that he must play three times that many this term if he is to stay with the club.
King admits he needs to play more, but is confident he can achieve that and can't see himself playing for any other club.
He said: "This is my biggest season at Spurs yet.
"It is the first time I have been in a situation like this - when my contract is up. So it is a big season.
"I have to prove I am still worth it. I can't see myself pulling on a shirt for anybody else at this stage of my career - although a player can never say never.
"At the end of the day, I just want to stay fit and if I can play, let's see what position that puts me in at the end of the season.
"It is down to me to play the games. If I don't play enough games, it is a difficult position.
"We will see what the situation is when all is said and done. If I get to 20 [games], I am not going to stop! I will keep playing as many as I can.
"At the moment I am just trying to bed in, get a bit of fitness and hopefully not get any niggles. If I can do that, I can get stronger and keep playing."
King admits it can be frustrating for him to spend most of his time in the gym and pool preparing for a game.
"I have to work in the gym to keep everything strong and spend time in the swimming pool. It is only that I don't get on the field," he said.
"Harry sees me on the field just the day before the game, which is why he says I do nothing.
"But the manager gives me a lot of confidence. He believes in me and it is nice that, if I can get myself right and keep myself fit, he still gives me the opportunity to go out and play. Some managers wouldn't, so I am grateful he stuck by me.
"It is only three games at the moment, so I have got to keep working hard and stay fit for the rest of the season.
"Last season I had a groin problem and have worked hard over the summer to get that right.
"Then I came back feeling good about the groin and the knee needed a bit of a clean-up again. That messed up my pre-season and obviously knocked me back.
"I was hoping to get a proper pre-season in this year, but that didn't happen, so I have had to build back up again. Hopefully it is behind me now."