Patrick Mouratoglou says Serena Williams' "heartbreaking" withdrawal from the US Open was the "only possible decision" for the American.
Williams on Wednesday revealed she will not play in her home grand slam due to injury.
The 23-time major champion has not played on the WTA Tour since suffering a torn hamstring at Wimbledon in June and she has not fully recovered.
Mouratoglou, Williams' coach, stated that pulling out of the final slam of the year was the only option for the six-time US Open singles champion.
He tweeted: "Since she had to pull out from Wimbledon, @serenawilliams has been fully committed to her recovery and we've done everything we could so that she could compete at the @usopen. But her body isn't ready. It is heartbreaking, but this is the only possible decision."
Since she had to pull out from Wimbledon, @serenawilliams has been fully committed to her recovery and we’ve done everything we could so that she could compete at the @usopen.
— Patrick Mouratoglou (@pmouratoglou) August 25, 2021
But her body isn't ready.
It is heartbreaking, but this is the only possible decision.
pic.twitter.com/P1zmhgn9Du
Williams posted on Instagram earlier in the day: "After careful consideration and following the advice of my doctors and medical team, I have decided to withdraw from the US Open to allow my body to heal completely from a torn hamstring,
"New York is one of the most exciting cities in the world and one of my favourite places to play – I'll miss seeing the fans but will be cheering everyone on from afar. Thank you for your continued support and love. I’ll see you soon."
Williams, who turns 40 next month, is the latest high-profile withdrawal from the tournament after Roger Federer and Rafael Nadal pulled out through injury
It will be the first time since 1997 that the US Open will be played without Williams, Federer or Nadal.
