Weiper, a talented Germany U21 international, has less than a year left on his current contract with Mainz. His impressive performances have caught the attention of several English clubs, including Tottenham, Brentford, and West Ham.
According to reports, Mainz values Weiper at around €15 million.
Heidel recently discussed Weiper's future, stating that they had a thorough conversation in the winter about their plans for the young player.
Heidel emphasized that the next step would be to sit down with Weiper after he returns from the U21 European Championship to reassess his situation and determine what's next.