The four Grand Slams say they want to "create meaningful improvements" in supporting players after Naomi Osaka's withdrawal from the French Open.
23-year-old Osaka, pulled out on Monday - a day after the Slams threatened her with expulsion for not talking to the media.
On Sunday, Osaka won her opening match against Romania's Patricia Maria Tig in straight sets and was fined $15,000 (£10,570) for not doing post-match media.
The Australian Open, French Open, Wimbledon and US Open have offered their "support and assistance" to her.
"We commend Naomi for sharing in her own words the pressures and anxieties she is feeling," they said.
"We empathise with the unique pressures tennis players may face."
The four major tournaments have faced criticism for the way they have handled the issue at Roland Garros.
