"I will resume training in a few weeks in a bid to win a third consecutive Olympic title next year," said Rudisha on Saturday.
The Kenyan, who has not raced since July 2017, says his first aim is to lose weight.
"I'm very positive about this because Tokyo 2020 is something I have been talking about over and over again, even before my injury. I want to do my best to be there and to take part in because not many of the 800m athletes have participated in their third Olympics," he added.
The injury forced Rudisha to relinquish his world 800m gold medal prior to the London World Championships two years ago.
"In 2017, I was looking forward to defending my world title in London. And just before those championships, while training in Kenya, I had a muscle pull. I had to stop. It was very tough as I had prepared for the whole season. I was ready, almost there. But I still had a lot of pain in my left leg," he said.
The Kenyan injury has meant Kenya had to settle for bronze at the World Championships in Doha from Ferguson Rotich. However, Rudisha believes when he returns, he will restore the order. Rudisha has just been a spectator, but every time he watches the men's 800 meters, there's always something drawing him to the track.
"To watch from outside it's quite different because I feel that emotion, adrenaline. Sometimes I find myself moving while I am watching. When I am supporting, maybe my compatriots, and when I see them making some mistakes, I feel like reaching out to them, but I can't," said Rudisha.
"I still feel like that is where I belong. I feel like I'm not done yet. It's tough for me to watch from outside. I'm used to being on the track more than outside here," he added.