Marcelo claims that Real Madrid are fully behind Zinedine Zidane "until death", as the club continues to stutter.
The Spanish giants sit fourth in La Liga, a staggering 17 points behind leaders Barcelona, and 10 behind second-placed Atletico Madrid.
Real have won two of their last four games in all competitions, and beat Sociedad 5-2 last time out, but their victory came after a draw with Levante and a Copa del Rey exit at the hands of minnows Leganes.
With a mouthwatering tie against PSG looming in the Champions League Round of 32, Marcelo has thrown his weight behind Zidane, who remains a club legend.
"Zidane is a great coach. We are with him until death," he told reporters at a news conference.
Marcelo has repeatedly talked up the talents of compatriot Neymar, previously insisting that he will eventually join Los Blancos.
And he has now stepped up his charm offensive, as the two prepare to step onto the same pitch this week.
"I think the Real fans would love to watch Neymar playing for Real Madrid," he said.
"He is a world star. Every fan would like to have Neymar in their team."
Zidane has attempted to look past the gigantic billing given to the clash of Neymar and Cristiano Ronaldo, and Marcelo has echoed his manager's sentiments.
"Neymar and Ronaldo are great players, that can score in decisive games," he added. "But I think the game is not just on both of them. They are great players."