Germany striker Werner completed a £50million move to Stamford Bridge in July after Chelsea met his buy-out clause at RB Leipzig.
The 24-year-old was keen to be joined at Chelsea by his compatriot Havertz and repeatedly messaged him in an attempt to put the deal through.
As it turned out, Havertz did not need much convincing and happily signed a five-year contract at Chelsea in September after they agreed a £71m fee with Bayer Leverkusen.
Asked whether it helped having Werner at Chelsea before his move to west London, Havertz said: ‘It helped a lot. We know each other well from the national team.
‘We’ve always been big friends. When I got the news that he would change [clubs] of course we messaged like every day.
‘He always said to me, “come, come [to Chelsea]!” It was like every day.
‘But I can speak English as well so I have a good relationship with every player but of course me and Timo are big friends and it was very important for me that he made the step and I made it too.’
Asked about his connection with Werner, on and off the pitch, Havertz added to Chelsea’s YouTube channel: ‘We’re really happy to be here.
‘We have a good connection on and off the pitch.’
Havertz has scored four goals and made three assists in 13 appearances for Chelsea this season. The Blues – currently third in the Premier League – face Leeds United on Saturday.