I hope he's not relying solely on Neymar, given the ocean of good players. Neymar stopped being a household name a long time ago; he's more of a minor celebrity than a great soccer player. Currently, he's living in the past, while Messi and CR7 are active and performing at their peak. Relying on Neymar for anything is repeating mistakes.
He's right, however things with Brazil are very delicate now, people are asking for it, people need it, and in this respect I understand why Ancelotti said he should prepare very well and be ready so that I can call him up for the World Cup. I think that above all, to be at his best, he has to work a lot on his fitness with strength exercises for his lower legs, in some way to make his ankle and knees stronger, so that he feels more secure when playing and doesn't get injured easily.