Havertz has scored four goals and registered two assists for Chelsea this season but has been accused of failing to make an impact during games.
Following the 3-0 win over Burnley on Saturday, former Chelsea defender Frank Leboeuf accused Havertz of ‘disappearing’ during matches and said he was ‘not convinced’ by the Germany international’s start at Stamford Bridge.
But Werner insists Havertz has already shown his quality for Chelsea and believes his Germany teammate will get even better for Frank Lampard’s side.
‘I know Kai very well and he is one of the most talented players in the whole world,’ Werner said ahead of Chelsea’s Champions League clash with Rennes on Wednesday.
‘He’s a young boy who’s 21 and can learn a lot but already he can play like a very, very old and wise player.
‘I think he feels very well here. He’s a little bit like me, we talk a lot about settling in and he is very happy to be here.
‘In a lot of games he has showed what his strengths are and what can bring into the team.
‘For Kai it’s important to score but I think how you can see in his games he is much more than scoring goals as a midfield player.
‘Like me, he has come to a new country with a new language and a new style of football and you have to learn but I think he’s played very well and we will see a lot more good games from him.’