"One of the problems the team has, is the well-known factor of anxiety", he told Onda Cero.
Neymar would move on of course, but in Ousmane Dembele, the Catalans have at least plugged the hole with a sensible purchase.
However, Perez's prediction for Ronaldo to equal Lionel Messi's Ballon d'Or tally of five may already be thwarted after rumours that the winner of the award has been leaked online. The centre-back has since managed just one appearance across all competitions, and he is currently out with a knee problem.
Cristiano Ronaldo and Lionel Messi have won the last nine Ballon d'Ors between them - but will one of them claim this year's prize?
In a couple of years, Real Madrid will have to play without him and they'll need strong replacements to fill the huge void.
The boots are inscribed with the dates of his previous wins and the current year
A total of 30 players are in contention to win the 2017 Ballon d'Or, a prize presented by the weekly football magazine France Football to the player it deems to be the best in the world over the calendar year.
Often referred to as the European Footballer of the Year award, the Ballon d'Or was the only honour of its kind until 1991. He likes to dribble and cut inside the box from the wings.
Transfer decisions have been alleged as being behind the supposed feud, with Ronaldo said to have been upset by the departures of good friends Pepe, Fabio Coentrao and James Rodriguez, who is at Bayern Munich on loan.
"Rather than negligent play there are many players who want to win the game by themselves".
"Spain, Germany, France, Brazil and Argentina will fight for it. Then, it depends on the group stage and the knock-out games".