That's a little bit weird but Real Madrid is thinking about hiring Sergio Ramos and returning this player to Real Madrid while Sergio Ramos is getting old and he is out of good form.
In Marca, they say they need better defenders. They think playing with Alaba, Militão, and Rüdiger won't be enough for a season with 72 games and they will need more players. Since Ramos is not playing for any team, they can consider making his return and this can be a good chance for Ramos to end his career in a team like Real Madrid.
Real Madrid holding back? I don't think so because they're promptly the best to acknowledge a smooth run when it involves major titles and winning made easy for them. Real Madrid will improved rapidly next season, because of the arrival of Kylian Mbappe. The Frenchman have understand the necessary arrangement to enter smoothen track of streak winnings.
Come to think of it, generating shocking interest in Sergio Ramos? It's strange because Real Madrid have outstanding players and fierce defenders, we should patiently watch how everything play out for them.
Until now I have not read the news that Real Madrid wants to bring in Sergio Ramos again. This seems very unlikely to happen to a club like Real Madrid because we know that Real Madrid is not a team that recruits old players. It is true that currently Real Madrid's defense doesn't have many options after Nacho left, but that doesn't mean that losing Nacho will make Real Madrid panic and then Sergio Ramos will come because that is very unlikely to happen.
It could be said that this rumor is fake, even if there is an issue like that, perhaps the people spreading this issue are indeed the fans who like Sergio Ramos and they really want Sergio Ramos to return to Real Madrid. But once again Real Madrid is not a team that is careless in recruiting players. Real Madrid is currently building a squad for the future because the average Real Madrid player is still young, especially as you said after Mbappe joined. Real Madrid has the ambition to defend the Lalagi and UCL titles next season.