The 22-year-old is enjoying a productive second season in English football and recently netted his 16th goal of the campaign for club and country in the 6-0 win against Southampton.
Following a challenging start to life in south-west London, the German now feels at home both on and off the pitch, thriving in a new central striker role for the Blues.
His growing impact on the team has been noticeable in recent months and Tuchel's man-management skills have clearly played a big part in that.
"I have a long road ahead so let's see what the next years bring to me," said Havertz told the club's website. "I love the club, I love the city and I'm very comfortable here. The team is very nice and the coach is good.
"We saw a lot of the good things that he did for us in the last year so we know that tactically he's one of the best coaches in world football and also that he can handle the pressure.
"He can handle the players very well and also a tough moment like this that we all have here at Chelsea right now so it's good to have him here."
On their end of season goals, Havertz added: "We are still in the FA Cup. We lost the final against Liverpool in the Carabao Cup but hopefully we can do it better in the next weeks against them and then maybe it would be not a perfect season but a good one. We are here to win titles and that would be the third title of the season, which is not so bad."
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