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Bayer Leverkusen told Liverpool to "make sure they keep laughing together" after Florian Wirtz followed Jeremie Frimpong to Anfield.
Frimpong's move to Merseyside was finally confirmed on Friday, a week on from the Reds agreeing a fee that could rise to £116 million ($157 million) for the Germany international.
Confirmation of Wirtz's move came three weeks after Frimpong's transfer from Leverkusen to Liverpool was announced, and Leverkusen issued a nice message referencing the pair's friendship.
In a post on social media platform X, Leverkusen shared a series of pictures of Frimpong and Wirtz from the pair's time together with the Bundesliga club, alongside the caption: "Inseparable.
Frimpong figured heavily in Wirtz's unveiling interview with Liverpool's media team, and he spoke extremely fondly of the Netherlands international.
"I played, I think, three or four years with him," Wirtz said of Frimpong.
"He's a really good player, a really good person, a really funny guy.
But I think I made my decision by my own, but it was maybe a small part that convinced me in the end as well.
"For sure [it's exciting to know I'll play with Frimpong again at Liverpool].
I'm really looking forward to standing on the pitch with him again."
Wirtz also revealed that Frimpong was responsible for improving his grasp of the English language; Frimpong speaks fluent English after moving to England as a seven-year-old, remaining in Britain until he left Celtic to join Leverkusen in 2021.
"Yes, he (Frimpong) was my neighbour in the changing room," Wirtz said
After I finished my school, I didn't speak really good English but he was teaching me a lot and making me speak in more English and better English."
Frimpong uploaded a picture on social media of himself alongside Wirtz earlier this week, suggesting that the pair were on vacation together
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