There have been reports that the Dutchman has lost the dressing room, but the Brazilian says that everyone is working together to turn the Rossoneri's season around.
The Dutchman has lost seven of his 12 games in charge since replacing Massimiliano Allegri at the helm in January, and it was reported during the week that the former Rossoneri midfielder had already lost the dressing room.
However, Kaka says everyone at San Siro is rowing at the same direction.
"I personally am happy but, just like my teammates, I cannot be satisfied with the results," the attacking midfielder told Mediaset. "The dressing room is united. We are trying to get out of this situation and it's up to us because we are we the ones that have to play.
"What I want to say to the fans is that there must be togetherness in these difficult times and that we will come out of together. Seedorf wants to get out of this difficult moment, just as we do."
Kaka took a wage cut in order to rejoin Milan from Real Madrid last summer and he dismissed suggestions that he must now be lamenting his decision to return.
"I have never regretted coming back," the Brazilian declared. "These difficulties are part of life.
"AC Milan will always be a great team. You can come across these difficult moments, but Milan will be great again."