BERLIN (REUTERS) - The Athletes Commission of the International Olympic Committee (IOC) on Saturday (Nov 20) said it was "very concerned" for Chinese tennis player Peng Shuai and hoped contact between her and fellow athletes could be established soon.

Former doubles world No. 1 Peng has not been seen or heard from publicly since she said on Chinese social media on Nov 2 that former vice-premier Zhang Gaoli coerced her into sex and they later had an on-off consensual relationship.

"Together with the worldwide athlete community, the IOC Athletes Commission is very concerned about the situation of three-time Olympian Peng Shuai," the commission, made up of athletes elected by their peers, said in a statement.

A two-time doubles Grand Slam winner and former world number one doubles player, Ms Peng competed for China at the 2008, 2012 and 2016 Olympics. Beijing will host the 2022 winter Olympics in February.

"We support the quiet diplomacy approach that is being taken and hope it will lead to the release of information about the whereabouts of Peng Shuai and confirmation of her safety and well-being," the commission said.

The Women's Tennis Association (WTA) has threatened to pull tournaments out of China, and the men's Association of Tennis Professionals (ATP) has demanded clarity from the Chinese authorities.

The United States has called for proof of Ms Peng's whereabouts and safety.

The IOC has said only that it believed "quiet diplomacy" offered the best opportunity for a solution.

Global Times editor-in-chief Hu Xijin, a prominent state-media journalist, said earlier on Saturday that Ms Peng has been staying at home "freely" and will make a public appearance "soon".