It was a rough 2020 for Roger Federer, and the start of 2021 may not be much better. Speaking at an awards ceremony on Sunday in Switzerland—where the 39-year-old was honored as Switzerland's greatest athlete of the past 70 years—Federer cast doubt on whether he would be healthy enough to compete in the 2021 Australian Open.

The six-time Melbourne champion has not competed on tour since February due to a right knee injury, but hoped that the 2021 edition of the major would be his comeback.

"But I still am not [100 percent] today. It will be tight for the Australian Open," Federer said. He also hinted that a comeback might not happen at all, but his priority is for the summer swing. 

However, the 20-time Grand Slam champion did seem excited "for what's to come."

Federer's last ATP match at the Australian Open was against Novak Djokovic in the semifinals where the Swiss lost in straight sets.