The Spanish midfielder is leaving Manchester City for Real today in a deal rising to €20m. Diaz will sign a Madrid contract to 2025.
The agreement includes a 15 per cent sell-on clause, however English media claims of an anti-United clause have been dismissed, says AS.
It was suggested City had demanded a clause stating that if Diaz was sold to United, Real would pay 40 per cent of the fee to the Blues. However, this claim has been denied.
Diaz will be presented to local media and fans on Monday at the Santiago Bernabeu.