Former doubles world No.1 Peng has not been seen or heard from publicly since saying on Chinese social media on November 2 she had been coerced into sex and later had an on-off consensual relationship with a former government offficial.

Such is the global outcry over Peng's safety and whereabouts, Pound said the situation could force the IOC to confront China over its human rights record.

Although the outrage is unlikely to stop the Beijing Winter Games going ahead in February, Pound would not completely rule it out.

"If that's not resolved in a sensible way very soon it may spin out of control," Pound, the IOC's longest serving member, told Reuters. "It may (force IOC into taking a harder line).

"Whether that escalates to a cessation of the Olympic Games I doubt it. But you never know."

The Chinese government has not commented on Peng's allegation. The 35-year-old tennis player's social media post was quickly deleted and the topic has been blocked from discussion on China's heavily censored internet.

The governing body of women's tennis (WTA) has called for an investigation and has threatened to pull tournaments worth tens of millions of dollars out of China.

Even though Peng is a three-time Olympian, the IOC has given no indication it is willing to take a similar stand and risk billions of dollars in television rights and sponsorships.

"I don't know whether we are there yet but I'm sure they (IOC executive committee) are following this to see where it is going," said Pound, a Canadian lawyer and former-Olympian.

"Action against one of its own citizens for airing a complaint about one of their higher ups - that's harder for them (China) to handle than the usual 'this is a domestic matter now get lost'."

Thus far the IOC has declined to comment on Peng's matter, saying it believed "quiet diplomacy" offered the best opportunity for a solution.

Pound conceded China does not respond well to threats and negotiating with sport and government officials requires nuance.

"That would be a little harder line than the IOC would normally be taking," said Pound, when asked if the IOC might demand a meeting with Peng.

"Where we have generated some change of attitude in the past we've said, "listen this is all out there in the public how do we respond. We can't ignore it.

"That in the past has produced some movement."

Meanwhile, world No.1 Novak Djokovic said the sport must stand together over the apparent disappearance of the tennis star.

"The whole community, tennis community, needs to back her up and her family, make sure that she's safe and sound because if you would have tournaments on the Chinese soil without resolving this situation, it would be a little bit strange.

"I do understand why WTA has taken a stance like that.

"I hope that for the sake of tennis, Chinese tennis, Peng Shuai, to find her very soon. It's terrible. I mean, this could happen to anybody in any part of the world.

"We just have to unite and stand together and show that there is no ignorance to this, that it's not like it's just I guess something that concerns China."

Australian Associated Press