In Madrid's 2-2 draw at Borussia Monchengladbach in the Champions League on Tuesday, with Zidane's side two down at half-time, Benzema was caught on camera appearing to discuss Vinicius.
"Brother, don't pass to him," Benzema told Mendy in the tunnel. "On my mother's life, he is playing against us."
👔💬 Zidane: "I've always said that here in Spain, there are no easy teams. All the teams are very competitive, very strong. And that makes for an excellent league."#RMLiga | #HalaMadrid pic.twitter.com/lm7RDoxA3u— Real Madrid C.F. 🇬🇧🇺🇸 (@realmadriden) October 30, 2020
Benzema did not play a single pass to the Brazilian in the second half, having created an opportunity with one of his three first-half passes, while Mendy found Vinicius just twice more before the latter was substituted in the 70th minute.
Zidane was not concerned by the part of Benzema - who pulled a gol back before Casemiro levelled - in the conversation, suggesting such exchanges are commonplace but not usually made public.
"It is clear about Benzema and Vinicius," Zidane said. "They have talked to each other. Things stay on the field. They talked and it is perfect.
"There is no problem between them - the opposite. In the end, the important thing is that the energy is on tomorrow's game [against Huesca].
"Things like Benzema and Vinicius have always happened but they stay on the field. The only thing that has changed is that there are many cameras."
By the time he made way for Eden Hazard, none of Vinicius' three shots had hit the target, with two blocked, while he did not pick out a team-mate with any of his three crosses, although he did create chances for both Benzema and Mendy.
A disappointingly low 71.4 per cent of passes found their man, however, and the 20-year-old completed only two of his five attempted dribbles.
But Zidane expects the forward to bounce back as he remains a big part of Madrid's plans.
"Vinicius is young," he added. "He has a present and a future at Madrid. He is a boy who wants to learn and improve. He works and that is good for a coach and a team."