That's because according to AS, United, along with Ronaldo's former clubs Sporting CP and Nacional, all have sell-on clauses which means they take a portion of the transfer fee paid for his next career move.
Ronaldo has denied any wrongdoing, and Madrid issued a statement last week saying it believed the player was innocent.
He was presented at the Bernabeu in front of 80,000 fans, as Perez attempted to bring together a second group of "Galacticos".
Ronaldo's inability to leave a mark on the game in other ways other than scoring has hurt his team at times, especially in the Spanish league.
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Ronaldo's trophy cabinet is stacked, having filled it up with three Champions League trophies, two La Liga titles and two domestic cup titles in the eight seasons he's spent in the Spanish capital. But, like Lionel Messi, his stock is going to fall sometime.
Perez's radio interview came hours after the 70-year-old businessman was reelected to a fifth four-year term as Madrid's president.
He did say Ronaldo is under contract, but everyone knows that.
Ronaldo is now in Russian Federation at the Confederations Cup, where Portugal got their campaign under way with a 2-2 draw against Mexico on Sunday.
This was a politician's way of addressing a hot topic.
It merely adds to the air of uncertainty.
Should Manchester United bid on what Ronaldo was or what he will be? And the wait may be a long one.
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Even if a trade agreement has been sealed, it could be introduced gradually during an "implementation phase" after Brexit . He said he views the talks with "informed optimism".
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There's also nothing barring Vegas from having a deal in place to select a player in order to trade him to another team. Each team had the option to protect seven forwards , three defensemen and one goalie, or eight skaters and one goalie.