The Daily Mail reports that Kaka has been offered to United on a season-long loan.
Real Madrid are keen to let Kaka leave as they expect to sign Luka Modric before the transfer window closes.
Galatasaray and AC Milan have also been linked with the 30-year-old.
Kaka did not feature for Real Madrid in their opening game against Valencia on Sunday night.
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Being an amiable guy is good for you and Jurgen Klopp is living proof.
Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.