Novak Djokovic ended his rollercoaster season with a Davis Cup defeat on Friday and then promised to make a decision on his Australian Open participation “very soon.” The World No. 1, who captured three of the season’s four Grand Slams in 2021 to take him level with Roger Federer and Rafael Nadal on 20, is still a doubt for January’s Australian Open after organisers insisted only fully-vaccinated players will be allowed into the country.

Djokovic, 34, has refused to say whether or not he has been vaccinated against COVID-19. His dream of adding a second Davis Cup to his 20 Grand Slam titles was shattered when Serbia were defeated by Croatia in the semi-finals on Friday.