Jamaica runner Aisha Praught-Leer has vowed to compete at the Olympics despite tearing her meniscus "off the bone".
The 31-year-old suffered a "freak, shocking" injury during training earlier in the week, and has been advised to undergo surgery.
However, Praught-Leer will delay going under the knife until after the Games.
The Jamacian will be in action on August 2 as the 1500-metre heats get under way.
"I tore my meniscus (a complete, off the bone root tear) on Sunday at training "a freak, shocking accident," the 31-year-old wrote on her Instagram page. I heard and felt a painful pop doing a drill, but then proceeded to do one of the best workouts of my life."
An MRI confirmed the injury on Wednesday and her doctor recommended she undergo surgery as soon as possible.
But that will not happen before she runs in Tokyo, Praught-Leer said.
"I will line up in Tokyo," she wrote. "When I arrive I'll get the fluid drained from my knee and get a cortisone injection (this is legal, and my surgeon understands and supports me in this)."
The 2018 Commonwealth Games 3,000m steeplechase gold medallist accepted she would be unable to compete to her best ability because of the injury.
"I want to keep believing in the possibility of achieving the wild dreams I store deep in my heart," she said.
