The 22-year-old forward was caught with a knee in the back in a challenge by Juan Zuniga late on in the Selecao's 2-1 quarter-final win Fortaleza on Friday and was ruled out of the rest of the tournament with a fractured vertebra.
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"Marcelo was scared and called the doctor on but the doctor couldn't get on in the confusion.
"It was a big shock, the image of Neymar being stretchered off to the helicopter, in difficulty, crying.
"Neymar was our benchmark, one of our references because he is a player who makes a difference in any team. We're in a situation where we've lost something we don't want to miss, especially for the semi-final and final."
Scolari added that Neymar, who had scored four times in the tournament prior to his injury, has requested to be in the stadium in Belo Horizonte for Tuesday's encounter with Germany and, should Brazil make it, the final too.
"He'll be with us if he can be, on the bench or in the stands," the 65-year-old confirmed. "We've asked this. It all depends on his state in the coming days. By his will, I've certainly felt that he will be."