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The Blues have already agreed a £47.5 million deal to sign Havertz's Germany international team-mate Timo Werner, with Lampard's side how being tipped to also land the Leverkusen sensation.
Havertz has starred in the Bundesliga over the course of the 2019-20 campaign and his form has alerted Europe's top clubs as they attempt to sign one of the world's most highly-rated young players.
Chelsea, though, haven't yet made a concrete offer for Havertz, with Lampard telling reporters ahead of his side's Premier League meeting with Manchester City on Thursday that no bid has been lodged.