The Londoners are the only side ready to pay what Leverkusen want for the Germany attacking midfielder.
Havertz, 21, is expected to cost €80m after add-ons, though the clubs must negotiate the terms.
Chelsea’s preference would be a lower base fee, for example €65m plus €15m in bonuses.
Personal terms should not be an issue with Havertz keen on joining Chelsea after telling Bayer he wants a move.
Crucially for Chelsea, Havertz’s desire to move to Stamford Bridge will not be affected if the Blues fail to qualify for the Champions League.
Many European giants, especially Bayern Munich, have expressed interest in Havertz, but can not fund a deal for him right now.
Havertz would be another eye-catching signing for Frank Lampard’s side after his outstanding 17-goal season.