Bayer Leverkusen coach has shown that the 21-year-old has made a decision about his future.
Frank Lampard is desperate to reach a deal for Havertz after the movements of Timo Werner and Hakim Ziyech.
Reports claim that the German game creator has already signed terms with the Premier League team.
Coach Bosz has now shown that the “crucial decision” to seal the deal could come today.
He told Deutschen Presse-Agentur: “I communicate a lot with Kai and look to feel what all this is doing to her.
“For example, those rumors about transfers.
“I see Kai handles all this very well.
“I don’t think I’m going to avoid the game when I was 29 [like Andre Schurrle].
“Yes, I know what you have to do, but of course I won’t give it away, it’s up to him to decide.
When asked when a resolution would be made, Bosz replied: “I couldn’t say it.
“Maybe the call will come today, maybe next week, maybe not at all.”
The Bundesliga values the striker at around 90 million pounds, but the Blues expect prices to reach 20 million pounds.
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