Havertz, 21, will join Frank Lampard’s Chelsea for an initial €80m. A further €10m will follow in easily achievable objectives. And another €10m could arrive based on what titles Chelsea win up to 2025.
The German super-talent will sign a five-year deal with Chelsea and contracts are currently being drawn up.
Havertz has been eager to move to Stamford Bridge and agreed personal terms weeks ago.
An official announcement should come in the next few days, ending one of the big summer transfer sagas.
He will follow countryman Timo Werner to Chelsea, who are investing heavily to improve their squad.