Federer has been rebutting suggestions of retirement for several years, but he said he was now aware injuries could force him off the scene.
The Australian Open marked his comeback from a six-month injury break, the longest of his career, after he underwent surgery for the first time last February.
“This is all about, you know, knowing that I have only so much tennis left in me,” he told reporters, when asked about the comment in his acceptance speech.
