The news comes just hours after Liverpool saw a $146 million offer for Alexander Isak rejected by Newcastle.
Newcastle has clarified that Isak is not for sale, but would only consider allowing a deal if its $197 million valuation was met.
After losing out on Hugo Ekitike to Liverpool, Newcastle has also stated that a replacement for Isak would need to be finalized before allowing him to leave.
Leipzig is understood to require a fee of $87 million to sanction a transfer this summer, with add-ons and a sell-on clause also integral to a potential sale.
Earlier this window, Newcastle attempted to sign Ekitike from Eintracht Frankfurt and planned to play him alongside Isak.
Hugo Ekitike snubbed Newcastle for Liverpool this summer.
Liverpool is keen to finalize a record transfer for Alexander Isak
Liverpool also secured $12 million from Real Madrid for the early release of Trent Alexander-Arnold.
Another high-profile player must be sold to come close to Newcastle's demands and fund a potential Isak transfer
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