The 20-time Major winner suffered back problems early in the season before withdrawing from Wimbledon and the Tokyo Olympics.
Nadal announced last month before the US Open that the recurring foot injury would not allow him to compete the rest of the year.
In an Instagram post, the 35-year-old Spaniard, fifth in the world, said he had completed his treatment. A source close to Nadal’s team said the left-handed player did not have surgery.
“I can tell you that I was in Barcelona with my team and the medical team to do a treatment on my foot that will need a few days of rest and a few weeks of inactivity,” he said.
“I’m already home and I’m beginning my recovery.”
Nadal, who was diagnosed with the foot problem in 2005, said that this time he was trying a different type of treatment to try to fix the problem and continue his career for a few more years.