That opens the possibility of the Swiss star partnering with Nadal, 18 years on from when they first faced each other on the ATP Tour in Miami.
The pair have met 40 times over the course of their careers — including nine grand slam finals — and also played together at the 2017 Laver Cup.
“For as long as we battled together, having always had this respect for one another — our families, our coaching teams — we always got along really well,” Federer told reporters when asked about the possibility of playing alongside the Spaniard.
“To go through the careers that we both have had, to come out the other side and being able to have a nice relationship, I think, is maybe a great message as well — to not just tennis, but sports beyond it.
“For that reason, I think it would be great. I don’t know if it’s going to happen, but I think it could be obviously a special moment.”
Federer said he had to obtain permission from Team Europe captain Björn Borg and tournament organizers to play in…