Kai Havertz is closing in on a move to Chelsea from Bayer Leverkusen after the clubs agreed a package of €80m plus €20m in add-ons for the midfielder.
Chelsea, who have been in talks with their Bundesliga counterparts for several weeks over a deal for the Germany international, concluded the negotiations for the club-record £89m transfer on Wednesday, according to Sky in Germany.
Havertz, who is keen to join the club as soon as possible, has not yet had a medical with Chelsea and remains with the Germany squad for their UEFA Nations League fixtures with Spain and Switzerland.
Chelsea's previous club-record deal was the signing of Kepa Arrizabalaga from Athletic Bilbao for £71.6m in 2018.
Earlier this week, Leverkusen's head coach Peter Bosz said the 21-year-old is unlikely to train for the club again as he nears a move to the Premier League.
Havertz looks set to become Frank Lampard's seventh summer signing, following the arrivals of Timo Werner, Hakim Ziyech, Ben Chilwell, Thiago Silva, Malang Sarr and Xavier Mbuyamba.
As part of the deal, Chelsea have offered Leverkusen the chance to sign one of their summer arrivals, Sarr, on loan for the rest for the season.