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The final figures of this deal are yet to be decided.
Sky Sports News previously reported Leverkusen's interest in Quansah as the Wirtz move began to progress.
Quansah - who has been in contention for a senior England cap in recent months - signed a new five-year contract at Liverpool last October.
Wirtz flying to Liverpool to complete £100m move
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He landed in the UK on Thursday evening.
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The Germany international, 22, is set to undergo a medical on Friday.
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Wirtz has been on his post-season holiday while Leverkusen and Liverpool tie up a deal that could reach a British-record fee of £116.5m.
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The player is set to sign a five-year contract on a minimum salary of £195,000 per week, which could become £245,000 per week with bonuses.
Wirtz only wanted to join Liverpool during this window, Sky Sports News understands, and not for the money.
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Liverpool head coach Arne Slot's tactical plan for the playmaker is said to be one of the key reasons he has chosen to move to Anfield.
Nunez open to joining Napoli
Latest news from Sky in Italy reporter Gianluca Di Marzio:
Liverpool striker Darwin Nunez is believed to be open to a move to Napoli this summer.
The Serie A champions have begun work towards a deal for the Uruguay international, but are not willing to pay Liverpool's valuation of £59.8m (€70m).
It is understood the Premier League champions will listen to offers for Nunez this summer.
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However, the defender only played in 25 games in total, 13 of which were in the league, as Slot's side won the title last season, with the new Reds head coach preferring to go with Ibrahima Konate instead as Virgil van Dijk's centre-back partner - despite the Dutchman actually picking the Warrington-born player for the top-flight opener at Ipswich Town.
Quansah, who only signed a new five-year Reds deal last October, recently suggested he may need to leave Anfield to progress his career.
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