\documentclass{book}
\usepackage[greek,ngerman]{babel}
\usepackage{varioref}
\usepackage[LGR,T1]{fontenc}
\usepackage{microtype}
\usepackage{hyperref}
% \makeatletter \def\@roman#1{\romannumeral #1}\makeatother %restore latex command works
\begin{document}
\pagenumbering{roman} %grr
\chapter{label}\label{chap:A}
blub\footnote{blub \vref{chap:A} blub}
\end{document}