Former CEO Adriano Galliani had distanced himself from his son Gianluca's bitter criticism of Milan directors.
"Directors with a salary package that is unique in world football who always dump responsibility on to Coaches and players without taking any themselves," wrote Gianluca Galliani, a regular in the stands at San Siro for decades alongside his father.
Adriano Galliani spoke to news agency Ansa about the post on social media.
"My son is an adult and makes his own decisions. I certainly didn't inspire those words and they do not reflect my thoughts."
Milan directors Paolo Maldini, Zvonimir Boban, Ivan Gazidis and President Paolo Scaroni have come under increasing attack from fans and media.