MFK Kosice have warned Fulham off striker Jan Novak.
The club's sporting director, Allen Bula, told skysports.com: "We are not prepared to lose our prize asset and it would take a very big offer to maybe change our minds.
"We know that eventually we will lose Novak to a higher league and the lad deserves it for all the hard work he gives the club.
"But he is our player and that's the way it will remain for now."