It comes after Murray fought back tears in his press conference, explaining severe hip pain would prevent him from continuing his career.
"At some point when you feel like you're never going to get back to 100%, you've had the success that Andy has had, you can only understand the decision".
"He has put that through in the way he has voiced his opinions and the way he has tackled some questions and issues that have arisen and I think everybody has always been very appreciative of him".
Scottish former world number one Murray tearfully revealed last week that severe pain from a hip injury was proving too much to bear and he planned to retire this year.
"Of course, it hits us top guys hard because we know Andy very well".
In a rare interview back in 2011, she told the Telegraph: "Even if my family asks me about Rafael, I prefer not to say much".
The Australian Open gets under way at Melbourne Park on Monday with a host of intriguing match-ups. "I don't have to have it that way", said Federer, who won three of his 20 major titles in the past two years.
"But he has a management company, he represents athletes and we have seen him in the commentary box".
"I can still play, but not to a level I'm happy playing at", said Murray ahead of his evening clash in Melbourne Arena on a day when temperatures are forecast to soar to 37 Celsius (98.6 Fahrenheit).
"Last year after Australia it took a while until I won a match again, so there are always those sort of silver linings, you could say. You deserve to retire on your own terms, whenever that happens", said current world No. 5 Juan Martín del Potro.
"Our trajectory to the professional tennis world was pretty much similar", added the Serb, who faces American Mitchell Krueger in the first round on Tuesday.
Meanwhile, Swiss maestro Roger Federer said there was a lot of things happening behind the scenes and said he would take soundings from other players on their views. It's hardly surprising that we're hearing this, when less than 3% of people shown playing sport in national newspapers are women.
Murray's career is expected to be finished in a matter of months. It's going to be uncomfortable.
Last year, seeded four, he crashed out in the last 32 to South Korea's Chung Hyeon and has only reached one quarterfinal in 14 major appearances.
Despite being the outright favorite to win the tournament, Djokovic finds himself in a rather tricky region of the draw - with names like Jo-Wilfried Tsonga, Denis Shapovalov, David Goffin, Daniil Medvedev, and Kei Nishikori floating around as potential opponents.
"But being honest, when somebody like him, that he achieved nearly everything in his tennis career, is suffering like he's doing for such a long time already ... probably he does the right thing for his mental health".