Serena Williams has played down fears that she could miss next week's Australian Open due to a shoulder injury.

The 23-time Grand Slam champion pulled out of the semi-finals of a warm-up event due to the issue yesterday but she's declared herself fit ahead of the first Grand Slam of the year.

"I feel pretty good. I've gotten a lot of treatment already on my shoulder," the American said of the injury.

"But I'm super confident it's going to be great. I'm feeling very confident, I think is a better word, and getting ready for hopefully the next two weeks."

39-year-old Williams is aiming to win a Slam for the first time in four years but she insists that her focus is on the present rather than her legacy.

"I didn't really think about that so much, I think at my age, my career, I really just try to go on how I'm feeling physically and not put myself in a bad position in general for my health."

Meanwhile, reigning champion Sofia Kenin has been struggling with a leg issue and admits a lack of preparation time on court due to COVID-19 quarantine protocols haven't helped her cause.

"After two matches, my leg is completely sore. You can see that being in a room for two weeks, not playing, practising, it's not the same as playing a match clearly.

"Today it is better and I want it to be better for the Australian Open."