Isinbayeva, the Athens 2004 and Beijing 2008 Olympic champion who finished third at last year’s London Games, told reporters in Shanghai that “everything will depend” on her performance on home soil in August.
“About my retirement, it is going to be a difficult decision, and you know it is difficult to say right now what I am going to do after the world championships in Moscow. It will depend on my performance there,” she said.
“I still would like to have my third gold medal. If I would have done it in London, for sure I could stop after Moscow. But for the moment I don’t know,” Isinbayeva added, ahead of Saturday’s Diamond League meet.
“I am just thinking what to do. Everything will depend on the Moscow world championships.”
Last week, former Soviet pole-vault great Sergei Bubka predicted that the outdoor world record-holder will end her career in Moscow, rather than push on to the 2016 Rio de Janeiro Olympics.
Isinbayeva, 30, had planned to retire after London, but she extended her career after she failed to become the first woman in history to win three successive Olympic crowns.
Although Isinbayeva has set 30 world records, indoors and outdoors, she took only bronze at last year’s London Olympics and failed to win a medal at either of the last two world championships.