Former world No 1 Amelie Mauresmo fears the 2020 tennis season could be over as Wimbledon chiefs prepare to make a decision on whether to scrap this year's tournament.
Tennis is at a standstill until 7 June, with the entire European clay-court season already wiped out by the coronavirus and Wimbledon expected to be officially cancelled on Wednesday.
Emergency meetings to settle the Wimbledon issue were taking place among All England Club chiefs on Tuesday.
Wimbledon organisers have ruled out playing the two-week grass-court tournament, slated to run from 29 June to 12 July, behind closed doors.
The French Open has already been postponed, shoehorned into the schedule in September after the US Open, and it will be difficult for Wimbledon to find a suitable date to rearrange.
Mauresmo, the 2006 Wimbledon champion, tweeted on Tuesday: "I think that we are going to have to draw a line under the 2020 tennis season.
"The international circuit = male and female players of all nationalities including their coaching staff, spectators and people from all over the world who bring these events to life.
"No vaccine = no tennis."
But three-time Wimbledon champion Boris Becker replied to the French player on Twitter, urging a positive approach.
"We should stop with all this doom and gloom - of course tennis will be played this year," he tweeted.
Mauresmo is also the former coach of Andy Murray, whose brother, Jamie, said cancelling the tournament at the All England Club was the only realistic option.
Murray, a two-time Grand Slam men's doubles champion, said postponing the tournament presented a series of hurdles, including shorter evenings.
"I think for them, it's difficult to move the tournament back because you're running into other tournaments that are for the moment still on the schedule," the 34-year-old Scotsman told the BBC.
"And also just things like daylight to host the event. Each week that passes, you get less and less light to play the tournament."
The vice-president of the German tennis federation predicted on Monday that Wimbledon would be cancelled and criticised the French Tennis Federation for moving the French Open to the autumn.
Je crois qu’on va devoir tirer un trait sur la saison 2020 de tennis. Circuit international = des joueurs et joueuses de toutes nationalités plus les encadrements, spectateurs et les personnes venant des 4 coins du monde qui font vivre ces événements.Pas de vaccin=pas de tennis— AmelieMauresmo (@AmeMauresmo) March 31, 2020
Wir sollten mit der Schwarzmalerei aufhören...natürlich wird diese Jahr noch Tennis gespielt https://t.co/xfqD9oSaBm— Boris Becker (@TheBorisBecker) March 31, 2020