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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The start of the 2017-18 Premier League season is just around the corner and is shaping up to be one of the most competitive yet.
As always it is the so called “big clubs” that have splashed the most cash in the transfer window so far this summer. Manchester United or City? Arsenal or Tottenham? Who are the winners and losers of the transfer window so far?