Novak Djokovic says he is "opposed" to vaccination.Credit:AP
"But if it becomes compulsory,what will happen? I will have to make a decision. I have my own thoughts about the matter and whether those thoughts will change at some point,I don't know.
"Hypothetically,if the season was to resume in July,August or September,though unlikely,I understand that a vaccine will become a requirement straight after we are out of strict quarantine and there is no vaccine yet."
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Last month,former women's world No.1 Amelie Mauresmo said the rest of the 2020 tennis season might be wiped out,saying action should not resume before players can get vaccinated against the novel coronavirus.
"International circuit= players of all nationalities plus management,spectators and people from the four corners of the world who bring these events to life. No vaccine= no tennis,"the two-time grand slam winner said in a widely shared tweet.
Medical experts have said vaccines against the respiratory virus would not be ready until next year,raising doubts whether any further tennis tournaments can be contested this year.
This year'sWimbledon championship was cancelled for the first time since World War II while the French Open,originally due to be held from May 24-June 7,was rescheduled for September 20-October 4,shortly after the end of the US Open.