Why is Kai Havertz struggling?

Kai Lukas Havertz is a German professional footballer who plays as an attacking midfielder or winger for Premier League club Chelsea and the Germany national team.

The Germany national football team represents Germany in men's international football and played its first match in 1908. The team is governed by the German Football Association, founded in 1900.

Chelsea Football Club are an English professional football club based in Fulham, London. Founded in 1905, the club competes in the Premier League, the top division of English football. 

Дмитрий Пукалик, CC BY-SA 3.0 GFDL, via Wikimedia Commons