Andy Murray thinks tennis players should "probably" be required to take a Covid-19 vaccine to be able to continue to play on the tour.
World number one Novak Djokovic said in April he "wouldn't want to be forced to take a vaccine to be able to travel".
But Murray hopes players would "do that for the good of the sport, providing everything has proved to be safe".
"I'm confident that players would be into it if it meant the tour going back to normality," said the Briton, 33.
"I guess we're not going to know the long-term effects potentially for a while.