After winning the Champions League in back-to-back seasons, and three times in four years, it feels somewhat silly to cast aspersions on Real Madrid's domestic form, especially when the club won La Liga a mere eight months ago.
Worrying times for Real Madrid and questions could soon start to be asked about the future of Zidane!
A late breakaway goal from Pablo Fornals, who chipped the ball over Keylor Navas after he had saved from Enes Unal, was the difference between the two sides and ramped up the pressure on coach Zinedine Zidane.
Real Madrid which has suffered runs of poor performance recently slipped to Villarreal at home on Saturday, handing Villarreal their first ever victory at the Bernabeu.
"We don't deserve this, we think we played well but the ball just didn't want to go in for us and I can not explain why", Zidane told reporters.
Perez has also received critics as he let go of players like Morata, James Rodriguez and Danilo without really replacing them.
Real edged the first half and Gareth Bale had a header ruled out for offside, before Cristiano Ronaldo's free-kick was tipped onto the bar.
Numerous team's issues were in evidence against Villarreal.More news: Kane Williamson takes a stunner to dismiss Pakistan's Hasan Ali
Bolstering his squad in the January transfer window is not something Zidane will do readily after repeating his stance that signing players out of season is his preferred method.
For the opening 73 minutes of their respective games this season, Villarreal held Barcelona and Real Madrid to a goalless draw.
Following this match, we take a look at some talking points from the Copa Del Rey tie.
The visitors scored what would prove to be the only goal of the game in the 27th minute when Antoine Griezmann cut the ball from the right towards Kevin Gameiro, who slotted past the on-rushing Marko Dmitrovic from close range.
Spain global Rodrigo Moreno struck the second in the 64th with the help of a huge deflection off Depor defender Pablo Mosquera.
The host had most of the chances under steady rain.
Kenyan forward Michael Olunga scored a hat trick to lead promoted Girona to a 6-0 trouncing of last-place Las Palmas.