Chelsea boss Jose Mourinho has highlighted the contributions of Gary Cahill and Cesar Azpilicueta this season.
Mourinho is delighted with the form of his defenders.
"We know that to win matches you need to score more goals than the opponent, but one of the ways you have to score more is if you don't concede," said Mourinho.
"We work, we prepare matches, we analyse opponents. You try to find the best balance.
"Defensively you try to make a shape, you try to find a balance. I like Ivanovic playing right-back more than as a central defender.
"I like a lot the stability of Cahill and the understanding of Cahill with John (Terry).
"And I think at this moment Azpilicueta is unbeatable. For many, many matches I haven't seen one player beat Azpilicueta in an individual duel.
"The team is compact, we have a good balance, we are playing well defensively."
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