Indeed, Sanchez insists no mater who plays in the back four, they are all in tune with eachother.
"Me and the four at the back, whoever plays, have all got to a point where we all understand each other, our weaknesses and our strengths, and we play to help each other out to have the best performance possible," Sanchez said.
"We have hit a point where we have become very consistent. There is always space to improve even more, which we know we can, but we are doing our best every game.
"We know if we keep a clean sheet that secures the team a point, and then the guys at the top will get us three. We need to make sure we keep a clean sheet because that will make the work of the rest of the guys easier."
Chelsea entertain in-form Aston Villa on Saturday.
"They are a very good team, ten wins in a row, so of course we want to break their stride, especially at home," said Sanchez.
"We don’t want anyone to get points from us at home. We have trained well this week and we are going to go out there, give our best, try to get a clean sheet and win the game."