The 24 year old has a release clause of €35M with the German club which the reds are ready to activate.
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Leverkusen play their final game of the season tomorrow away at Mainz as they have failed to remain Bundesliga Champions after last season's magnificent exploits.
Their manager, Xabi Alonso, will also be taking charge in his final game before his move to Real Madrid.
Frimpong's release clause will also hand a £5M sell on fee to Celtic who sold the player to the German side back in January 2021.
Prior to his 15 months at Celtic he spent almost a decade, from the age of 9, with Manchester City's academy
Conor [Bradley] can play it, Joe Gomez, so it is not like once Trent leaves I don't know what to do but we are always looking at interesting players, who can improve our squad."
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