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The former world No.1, who will be 41 in August, has not played since July last year.
The main draw singles players competing in the first round will be playing for 50,000 pounds.
The Spaniard's record-extending triumph on the Paris clay earned him an all-time best 22nd men's singles major with a 6-3, 6-3, 6-0 crushing of Norway's Casper Ruud and put him two titles clear of Roger Federer and Novak Djokovic.
In a one-sided final, the Spaniard crushed Norway's Casper Ruud 6-3, 6-3, 6-0.
The French pair recovered from a set down to beat Americans Coco Gauff and Jessica Pegula 2-6, 6-3, 6-2.
The world No.3-ranked player posted an image on Instagram of him alighting from a private plane walking on crutches.
Swiatek lost just one set during this year's Roland Garros campaign, extending her winning run to 35 matches.
Zverev had to be pushed off the Philippe Chatrier court on a wheelchair after twisting his ankle late in the second set as he trailed 7-6(8), 6-6 in his meeting with 21-time Grand Slam champion Nadal.
The French Open tournament director added that her comments were taken out of context.
They went down fighting to Jean-Julien Rojer and Marcelo Arevalo 6-4, 3-6, 6-7.
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