Injuries have influenced the ATP Tour very seriously this year.
He became the oldest man to secure top spot in the end of season rankings when he beat Hyeon Chung in his opening match on Wednesday. He had won five consecutive French Open titles from 2010-14.
Nadal will next face Pablo Cuevas in the last 16 on Thursday, after the unseeded Uruguayan edged out Albert Ramos-Vinolas 6-7 (5/7), 7-6 (7/1), 6-2.
Nadal has fought back this year from a series of injuries, winning the French and US Open titles. "And longer term, I'm going to do the treatment I believe that is going to be more safe and more important to keep playing tennis as long as possible".
A far cry from his condition a year ago, sitting on the sidelines for most of the second half of 2016, nursing a wrist injury and falling to ranking #9, the Mallorican native focused on the opening of his new tennis academy, inviting his also-injured friend and rival, Roger Federer, to appear in the opening ceremony. "For me it's not about London, it's about the longer term".More news: Apple projects record holiday sales on iphone X demand
Victory in Sunday's final in Paris would see Nadal move clear of Novak Djokovic with a record 31st Masters crown.
Nadal said he would "do his best" to return for the season-ending event in London, which takes place from November 12-19.
The 35-year-old had not managed a win over a top-10 player since 2014 before this week, but has now claimed two in as many days after knocking out seventh seed David Goffin in the last 16.
In 2015, Nadal won just three singles titles and failed to make it past the quarterfinals at any of the four Grand Slam tournaments during the season.