Ondrej Mazuch is set to quit Fiorentina in January.
The young Czech Republic defender is unsettled in Florence and Dad, Vladimir, revealed: "I have spoken several times with my son about a fresh start.
"Fiorentina are unwilling to free him and hope that everything remains as it is. The interest of Bayer Leverkusen, however, is considerable. For Ondrej, we've also talked about the presence of Sparta Prague."