The tennis great took to social media to share a valuable piece of advice on expectations.
Twenty Grand Slam titles over 24 years, including being the winner of all four championships together, in the harsh and demanding world of professional tennis speaks volumes of the champion.
Frances Tiafoe sealed the title for Team World with victory over Stefanos Tsitsipas.
Federer, who won 20 major singles titles, played Nadal 40 times in one of the most compelling rivalries across any sport.
In front of a 17,500 sell-out crowd in London, 20-time Grand Slam champion Federer returned from more than a year away for a last dance in tandem with his great rival on a gripping and memorable finale by the Thames.
The iconic duo will join forces at the Laver Cup on Friday.
The iconic player made his announcement via a lengthy social media post.
The three-day team event pits six of Europe's top players against six from the rest of the world.
The former world No.1, who will be 41 in August, has not played since July last year.
Federer said he will know by April or May whether he can return to action following a third knee surgery.