Federer, playing his first clay court event in three years, lost in three sets to Austrian Dominic Thiem in the Madrid Open quarter-finals on Friday.
"Hello everybody. Just finished speaking to the team and happy to say I'm coming back to Rome to play in Italy," the 37-year-old sais in an Instagram video on Saturday.
Federer will have a first-round bye as the number three seed in Rome, where he will begin his tournament against either Frances Tiafoe or Joao Sousa.
The Swiss has never won on the clay in Rome's Foro Italico having finished runner-up four times.
His only title at the French Open, which this year starts on May 26, was in 2009.
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