The 25-year-old Brazilian insists he's not afraid to take on anyone, whether it's a first-team newcomer, or long-term servant of the Stamford Bridge club.
In fact, Luiz revealed how he has already had run-ins with Chelsea captain John Terry and vice-skipper Frank Lampard, during stormy dressing-room inquests, and almost came to blows with former striker Didier Drogba following a training ground incident.
The former Benfica star, who arrived in west London on a five-and-a-half year deal for a reported €25million fee, defended his actions, though, saying his behaviour and opinions are not intentionally disruptive, and instead should help benefit the team.
"Having words with someone is something positive for the team and the players have to feel comfortable with it," said Luiz. "I knew the responsibility of wearing the Chelsea shirt when I came here.
"But I got it into my head that I could never let myself be intimidated by the fact that the club had big names.
"I've had words with Frank and John, for example. Didier Drogba and I nearly clashed when he got angry after I asked him to help with marking in training. But afterwards he made a point of admitting that I was right."
Chelsea are currently seven games without a win in the Premier League, with interim manager Rafa Benitez still waiting for his first victory, after losing 3-1 to West Ham at Upton Park on Saturday.
Tomorrow, the Blues face Nordsjaelland in the Champions League, and need to win, while hoping that Juventus lose to Shakhtar Donetsk to avoid becoming the first holders to crash out of the competition at the group stages.