The forward took a knee to the back in a late challenge by Juan Camilo Zuniga in Friday's 2-1 win over Colombia, suffering a fractured vertebra, and is now expected to be sidelined for an extended period.
The Paris Saint-Germain defender does not hold any grudge against the culprit but is hurting for a player he describes as his "brother".
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"Am I angry? No. I've not seen the video so I don't know how it happened.
"I never crucify players because in life you do things because you don't think, you're emotional. If [Zuniga] wanted to do that, he'll feel sad. If he just tried to stop the game, that's natural, that's football."
Brazil are still in the running for what would be a sixth world title but, if it is achieved, it will be dedicted to a broader cause than just the 22-year-old, says Luiz.
"We'll try to win the competition for Brazil!" the ex-Chelsea man enthused. "It would be great if we can win and we can celebrate with him."
It was Luiz's superb free kick that proved the winnner against the Colombians and he joked that it was down to his "genetics".
The centre-back struck an unstoppable shot in the 69th minute to give Brazil a 2-0 lead - only his second goal for his country, with the first coming against Chile in the second round.
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Brazil's win sets up a semi-final clash with Germany on Tuesday and Luiz is full of respect for Joachim Low's side.
"They are a great team with a great coach and a great philosophy to play football," he warned. "It will be a great game."
In that match, however, Luiz will be without central defensive partner Thiago Silva, who picked up a yellow card on Friday and will be suspended against Germany.
"The other two [Dante and Henrique] who can play are also great players," Luiz remarked. "They are dreaming of playing in a World Cup. We'll miss our captain but we will be well served. God touched this man beside me [Luiz Felipe Scolari] - and he knows how to find the best players."