Los Merengues are currently eight points adrift of Barcelona after just four games, with their latest 1-0 loss to Sevilla prompting early speculation that the title race is already over.
Ramos, speaking in the wake of the latest setback, spoke in support of manager Jose Mourinho's post-match comments in Seville.
"He [Mourinho] is the best [manager] football has seen," the Euro 2012 winner told Marca. "True, it is time to consider what we can do to improve and change this."
"The time has come to improve and change attitude. I always say that we are guilty [when losing], from the first to the last.
"When we win, we do it all together and when we lose, it's the same."
Los Blancos will be looking to bounce back on Tuesday when they open their Champions League campaign against Manchester City at the Bernabeu.