Discussions have primarily been conducted through Havertz's entourage so far and qualification for next season's Champions League through a top-four finish has only strengthened Chelsea's hand.
The Blues were waiting to see the outcome of their league campaign before doing further business after completing the double signing of Timo Werner and Hakim Ziyech for a combined fee of £91 million ($114m).
However, Bundesliga club Leverkusen have yet to receive any official offers after putting an asking price on Havertz at around €100m (£90m/$111m). It is felt that a lower fee will ultimately be negotiated at around €76m (£70m/$87m).
Chelsea's confidence centres around their financial might in the upcoming transfer window, having recently been under a transfer ban while selling Eden Hazard for £88m ($113m) to Real Madrid and Alvaro Morata to Atletico Madrid for £58m ($75m).
Madrid and Bayern Munich were both interested in Havertz, who is pushing for a move following Leverkusen's failure to qualify for the Champions League, but both clubs may not have the funds to complete a deal.
Bayern are unable to make any other major transfers due to the financial impact of coronavirus alongside their lucrative signing of Manchester City's Leroy Sane. Similarly, Madrid have ruled out major deal this summer due to the economic realities of the pandemic.
Havertz is back training with Leverkusen ahead of their Europa League campaign but the talks may lead to the 21-year-old missing the upcoming game with Rangers, much like how Werner opted out of RB Leipzig's Champions League run.
Chelsea are still considering strengthening their defence as they weigh up future contract discussions with both Andreas Christensen and Antonio Rudiger, who both have less than two years left on their deals.
The west Londoners have also been scouting and considering their options regarding a goalkeeper since January, and Kepa Arrizabalaga was dropped from his number one goalkeeping spot for the second time this season against Wolves on Sunday with 38-year-old Willy Caballero promoted in his place.
However they have to find an escape route for their £71m ($91.5m) record signing before considering their options. Valencia have shown an interest in a loan move but it remains to be seen whether they can even afford his £170,000-a-week wages, never mind any other fees.
The transfer window officially opened on Monday for English clubs following the completion of the Premier League season, and it shuts on October 5.