Serbian tennis player Dusan Lajovic says he’s not sure whether Novak Djokovic will play the Australian Open and he and other teammates don’t know the reason why Djokovic pulled out of the ATP Cup.

Djokovic, 34, would be bidding for a record 21st Grand Slam title and a 10th Australian Open crown at Melbourne Park beginning January 17. He is on the entry list but yet to commit to the Australian Open following the COVID-19 vaccination mandate agreed to by Tennis Australia and the Victorian (state) Department of Health.