Tennis governing bodies take mental health issues extremely seriously but are aware that more needs to be done to support players in that area, International Tennis Federation chief David Haggerty said.

Naomi Osaka's withdrawal from the French Open in May highlighted the issue of athlete well-being and after American gymnast Simone Biles pulled out from the team and all-around events this week in order to protect her mental health, the subject is back in focus.

"Mental health is very, very important," Haggerty, who is also an International Olympic Committee (IOC) member, said in an interview at the Games.