Why Antonio Rüdiger is the most important player for Thomas Tuchel's Chelsea?  

Antonio Rüdiger is a German professional footballer who plays as a centre-back for Premier League club Chelsea and the Germany national team. Rüdiger began his career at VfB Stuttgart, representing their reserves in 3. Liga and the first team in the Bundesliga.

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

Thomas Tuchel is a German professional football manager and former player who is the current head coach of Premier League club Chelsea.