Schalke value Tottenham target Max Meyer at €20m (£17m), reports Bild.
Spurs have been linked with a summer move for the Germany international, who is out of contract next year.
Meyer has struggled to convince Schalke coach Markus Weinzierl of his qualities, but did win his praise for a fine performance in a 4-1 Bundesliga win over Wolfsburg on Saturday
Nevertheless, with Meyer out of contract in 2018 and no new deal talks on the horizon, the attacking midfielder is clearly edging towards the exit door.
Asked about a contract extension, Heidel was quoted as saying by Bild: “At the moment it does not make any sense to think about it.
“Max has to convince the coach that he belongs in the starting eleven”, he added.
It is claimed that coach Weinzierl views Meyer as replaceable, another factor which hints at an impending Premier League switch for the 21-year-old.