Patrick Moratoglou, speaking to the *New York Times*, said the pectoral injury that prompted her to withdraw during the French Open was "muscular" and would "probably have become a tear" if she had kept playing the tournament.
"So in 15 days, it should normally be healed, and she will be able to play again," he said.
Williams will take a break and then start training again at Moratoglou's academy, he added. She plans to arrive in Britain a week before Wimbledon.
WATCH—Patrick Moratoglou discusses Serena's injury after her withdrawal: