Kai Havertz has an agreement in place with Bayer Leverkusen that allows him to move in the next transfer window if certain conditions are met, Rudi Voller has said.
The Germany international enjoyed a stellar season in the Bundesliga, scoring 12 goals and assisting a further six.
Havertz's form has seen him linked to a big-money exit, with Real Madrid, Bayern Munich and Chelsea all said to be interested in an attacking midfielder Leverkusen reportedly hope to receive €100 million (£90m/$112m) for.
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Sporting director Voller hopes to persuade Havertz to stay one more season but concedes there is a mutual understanding between the club and the player over a potential transfer.