The Blues have not enjoyed a smooth start to their European campaign, dropping points at home to Juventus and losing against Shakhtar Donetsk in Ukraine.
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"If we're going to be successful, we have to be defensively strong as a team," he told reporters.
"This is the part of the game we have to improve as a team. I'm sure we can create chances against any team, and can score the goals.
“The question is about our defence and that's what we're going to work harder on. The importance is to be solid and compact, in the group stage especially.
"If we do that, we'll be successful because, for sure, we'll still create the chances."
The west London side face Shakhtar Donetsk at Stamford Bridge on Wednesday evening.