Liverpool are willing to sell Sepp van den Berg this summer.
The defender spent last season on-loan with Mainz and is ready to leave.
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Sky Sports says the Reds will sell Van den Berg if an offer of £20m arrives for him.
PSV Eindhoven have already made an offer for the youngster, but it fell short of Liverpool's valuation.
Mainz are keen to re-sign him, with VfB Stuttgart also watching developments.