Kaka has only been back at AC Milan for two weeks but will have become even more popular with the fans during his second spell.
The Brazilian suffered an abductor injury in the 2 - 2 draw against Torino on Saturday. But he has asked Milan not to pay his wages during his time on the sidelines.
He said: "I have decided that I don't want anything from Milan except their support and affection. Until I am fit again and ready to play, I have decided not to receive my wages. The affection I have felt in recent days gives me the added motivation to get fit as soon as possible."
Kaka is likely to be out for a month.