British number one Dan Evans says he is unsure if the Australian Open quarantine rules will allow players "enough preparation" to perform at their best.
Players must quarantine for 14 days on arrival in Melbourne, and will be allowed out of their rooms for five hours each day for training and meals.
"That will be a different experience and we will have to learn how to manage ourselves in that time," said Evans.
The Grand Slam starts on 8 February.
It was scheduled to start on 18 January but was pushed back three weeks because of the quarantine restrictions imposed by Victoria state government officials.