Nurnberg striker Josip Drmic remains up for grabs.
Bayer Leverkusen technical director Rudi Voller admits his club do not have a pre-contract agreement signed with the player.
He told Bild: "Drmic is an interesting player. But I also know other clubs [are interested]. [Pre contract agreement] that is nonsense."
Arsenal, Newcastle United and West Ham United are all keen on the Swiss.
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