Mainz sports chief Christian Heidel says they won't meet the asking price of Liverpool for Sepp van den Berg.
The Dutch defender spent last season on-loan with Mainz and is keen to leave Liverpool this summer.
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But the Reds' asking price is deemed too rich for Heidel, who stated on Friday: "We want him to stay and Sepp really wants that too. But we also respect that Liverpool has not yet taken a final decision on this.
"We don't buy players who cost more than 20 million euros, which Liverpool likes to see.
"That goes against our philosophy."