Roberto Jimenez believes his former club Atletico Madrid has developed into a team that opposition fear under the guidance of Diego Simeone.
The Spanish goalkeeper, who currently represents Greek outfit Olympiacos, left the club in 2014 after playing second fiddle to the likes of David De Gea and later Thibaut Courtois.
And Jimenez believes that the whole philosophy of the club has been transformed under the tutelage of the Argentine tactician.
"I went through those moments when we faced Real Madrid or Barca and you knew that you were going to lose. And we even thought about not losing by too many goals. Now things have changed a lot," the 30-year-old told Goal.
"Atletico are a team to fear, not only in domestic competition but also at a European level. They achieved that by being the best defensive side and being more lethal than before in attack. With that in mind, the team can reach whatever they want.
"It was when I left that Simeone arrived. He was the one that cleaned up Atletico's act and they started winning titles. I would really like to be in this side enjoying so much, especially because of the respect they command.
"During my time there the squad had so many tough moments, coach changes, seasons with not very good results… But you do not choose when you are in any one place and I feel proud of having been there."