The best German tennis player foregoing the clay court tournament, which begins on Thursday, confirmed Kerber’s management on Tuesday of the German Press Agency.
However, the start of the tournament in Rome, which began on May 9, is not in danger.
The 34-year-old Kieler Kerber had traveled to Stuttgart for the tournament after the defeat with the German women’s team in Kazakhstan.
There, the former number one in the world had lost in the first round last Wednesday.