THE Women's Tennis Association (WTA) said on Wednesday it will suspend lucrative tournaments in China immediately due to concerns over the treatment of former doubles world number one Peng Shuai and the safety of other players.

The decision to pull tournaments that could cost the U.S.-headquartered WTA hundreds of millions of dollars in broadcasting and sponsorship comes as Beijing is preparing to host the Winter Olympics next February.

Peng's whereabouts became a matter of international concern following a nearly three-week public absence after she posted a message on social media in early November alleging that China's former Vice-Premier Zhang Gaoli had sexually assaulted her. Neither Zhang nor the Chinese government have commented on her allegation.

"I don't see how I can ask our athletes to compete there when Peng Shuai is not allowed to communicate freely and has seemingly been pressured to contradict her allegation of sexual assault," WTA Chief Executive Steve Simon said in a statement.

"Given the current state of affairs, I am also greatly concerned about the risks that all of our players and staff could face if we were to hold events in China in 2022."

Peng did appear in mid-November at a dinner with friends and a children's tennis tournament in Beijing, photographs and videos published by Chinese state media journalists and by the tournament's organisers show.

On Nov. 21, IOC President Thomas Bach had a 30-minute video call with Peng - a three-times Olympian - during which she told him she was safe and with family and friends.

But Simon, who said the decision to suspend tournaments in China, including Hong Kong, had the full support of the WTA Board of Directors, said they were not convinced all was well with Peng.

"While we now know where Peng is, I have serious doubts that she is free, safe, and not subject to censorship, coercion, and intimidation," said Simon.

"The WTA has been clear on what is needed here, and we repeat our call for a full and transparent investigation – without censorship – into Peng Shuai's sexual assault accusation."

The WTA's aggressive expansion into China began just before the 2008 Beijing Olympic tennis tournament, and local interest in the sport was fuelled by Li Na winning the 2011 French Open.

In 2008, China hosted just two WTA events. That grew to nine by 2019.

In 2018, the city of Shenzhen bagged a 10-year deal to host the season-ending WTA Tour finals with a breathtaking bid that doubled the prize pot to $14 million a year. The WTA had also announced a 10-year deal starting 2017 with streaming platform iQiyi as its digital rights partner in China, reportedly worth $120 million.

Simon had previously said the WTA would walk away if it was not satisfied with the response to Peng's allegations.

"Unless China takes the steps we have asked for, we cannot put our players and staff at risk by holding events in China," said Simon on Wednesday.

"China's leaders have left the WTA with no choice. I remain hopeful that our pleas will be heard and the Chinese authorities will take steps to legitimately address this issue."