Mainz sporting director Christian Heidel admits they're facing crunch time over the future of young striker Nelson Weiper.
The Germany U21 international has less than a year to run on his current Mainz and is attracting interest from several English clubs, including Tottenham, Brentford and West Ham.
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Mainz are said to rate Weiper at around €15m.
And Heidel told BILD: "We had a long conversation in the winter in which I outlined what we planned for him.
"Now comes the next step. When he returns from vacation (after the U21 Euros), we'll sit down together again and see what happens."