David Luiz has revealed Chelsea have been given the right to express their opinions on the field during matches.
The Brazilian centre-half insists being able to criticise one another on the field has inspired them to emerge from their recent crisis.
Luiz, 24, has been at the centre of much scrutiny from pundits for his gung-ho approach to games where he has shown a tendency to surge upfield and forget his defensive duties.
However, the £24million January signing looks to be settling into his role at Stamford Bridge and has inspired the Blues to the last 16 of the UEFA Champions League where they will meet Napoli.
And Andre Villas-Boas' side have been steadily improving after winning their last three games, including a 2-1 victory over Premier League leaders Manchester City on Monday night.
Luiz told The Sun: "We have complete freedom on the pitch to give our opinions, and to speak out - even to the extent of criticising our team-mates harshly.
"We were not having such a good spell recently, but now nobody talks about that.
"That is the product of our attitude and confidence. We all have independence within the squad."