The world no. 1 says a vaccine may be compulsory for players in order to compete.
Novak Djokovic may face an even longer delay in returning to tennis, when the sport does resume.
The 17 time Grand Slam champion has said he opposes vaccinations, which may be required for players to be allowed compete.
The world number 1 says a vaccine may be compulsory for players in order to compete.
Medical experts have said that vaccines against the respiratory virus would not be ready until next year, raising doubts whether any further tennis tournaments can be contested this year.
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