Nadal to play Paris Masters next month
The 34-year-old won a record-extending 13th French Open title earlier this month with a one-sided final victory over world number one Novak Djokovic at Roland Garros.
"It's indoor season time... this picture was earlier today practicing at @rnadalacademy," he posted on Twitter alongside a photo of him training.
"And yes... getting ready for #ParisBercy."
Any health rules to be implemented for the event due to the coronavirus are yet to be announced.
After moving level with Roger Federer on a men's record 20 Grand Slam titles, Nadal said: "I don't know what I'm going to do after Roland Garros.
"I can't tell you if I'm going to play again or not in the next two months."
He pulled out before a scheduled semi-final against Denis Shapovalov at Bercy in 2019.