  Let $f\in\mathbb{Z}[T]$ be any polynomial of degree $d>1$ and
$F\in\mathbb{Z}[X_{0},...,X_{n}]$ an irreducible homogeneous polynomial of
degree $e>1$ such that the projective hypersurface $V(F)$ is smooth. In this
paper we give a bound for \[
N(f,F,B):=|\{\textbf{x}\in\mathbb{Z}^{n+1}:\max_{0\leq i\leq n}|x_{i}|\leq
B,\exists t\in\mathbb{Z}\text{ such that }f(t)=F(\textbf{x})\}|, \] To do this,
we introduce a generalization of the Heath-Brown and Munshi's power sieve and
we extend two results by Deligne and Katz on estimates for additive and
multiplicative characters in many variables.
