Federer begins his Australian Open title defence on Monday against Denis Istomin.
Federer, who is now ranked number three in the world, said: "I guess everybody can understand where he comes from".
A number of prominent women in the sport have paid tribute to Murray for taking a stand against sexism and pushing for equal prize money at tournaments after the Briton revealed on Friday that he might be forced to retire after the Australian Open due to a troublesome hip injury.
"He doesn't have many enemies, to be quite honest".
"I was disappointed and sad, a little bit shocked, to know now that we're going to lose him at some point", Federer said on the eve of the year's first Grand Slam.
"I feel good. I practised very well these days".
"I have a lot of places that are very special to me, thankfully". So sorry you can not retire on your own terms, but keep in mind to look to the future. "The problem is it's not his decision, it's the body's decision and that naturally hurts".
Murray has played a mentoring role with a number of British players but none more significant than Edmund, who overtook him as the country's leading player after reaching the semi-finals here 12 months ago.
'So I can't have a real opinion on all of this, because no one of my representatives came to me and asked me if I am happy with the president or not.
With Murray doubting his ability to compete, Britain's best chance looks to lie with Kyle Edmond - now ranked 14 in the world.
Australia's Tomic has been handed a high-profile first-round match against last year's runner-up Cilic. "I want to do it as long as I can and give myself the best possibilities to fight for the things really I am passionate about".
The fab four may have accounted for 50 of the last 55 Grand Slams. Last year I drew [Kevin] Anderson, this year Berdych. He'll win match after match.
"[Simona] Halep is one, Kerber is two and there are so many players close behind that it is just so open".
The Serb, who turns 32 in May, shares the record with Federer and the legendary Australian Roy Emerson, who held the overall Grand Slam record of 12 titles.
The Bulgarian fought back after losing the first set in the Australian Open first round.
Denmark's Caroline Wozniacki is the defending champion and is seeded third heading into the tournament.
Hi Melbourne Hi @RodLaverArena Nice to be back here again!
After her breakthrough here past year, she didn't get beyond the fourth round at the other majors, but says she feels like she's hitting the ball well.
'For me will be, I will feel supported if I receive economical - if the ATP did an economical support to that people during that bad period of time that we had at home, and with people that was very next to me.