Kaka out of derby but foot not broken
The playmaker, who was injured during Saturday's 1-1 Serie A draw with Reggina, will miss Brazil's friendly with Italy on Tuesday and next Sunday's league derby with Inter Milan.
"Kaka reported a trauma to his left foot. The checks made after Milan-Reggina did not show any kind of fracture," Milan said in a statement.
"The prognosis is at least 15 days," a later statement added.
Kaka scored a 67th-minute penalty to give a lacklustre Milan a point at home to bottom club Reggina but soon asked to be substituted after taking a knock.