Cape Town - Andy Murray's mother Judy has revealed the tough time her son is having after injury may force him to have more surgery.
The three-time Grand Slam winner confirmed last week that his comeback had been delayed as his latest injury is "unbelievably complex".
Although his return date remains a mystery, he also didn't rule himself out of the ATP Masters 1000 Miami Open, which starts on March 23.
And his mother Judy says his current struggle is an "incredible physical and emotional" battle, saying he will only return when he is ready.
"Andy's got so many fans out there and everybody wants to know when you're going to see him again," she told Zara Janjua on the Royal Bank of Scotland's Ask For More podcast.
"Often the answer to that is 'I don't know'. Because you don't know. You don't know how long an injury is going to take to rehab or repair itself or what more you might have to go through.
"You do your rehab, you go back into training. You start gently, you build it up. You test it out, you go into competition. You test it out there.
"Then you see where you're at and you have to adjust your schedule of training and competition to create a balance.
"You can't just go from doing nothing for a long time to doing five sets at the Australian Open, for example.
"He's not going to rush anything, he's going to take time and make sure his body is absolutely ready before he puts it back in again. But it's an incredible physical and emotional challenge for him."
- TEAMtalk media