|Birth Day:||June 11, 1999|
|Birth Place:||Aachen, Germany|
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He began his youth soccer career in the youth academy of Alemannia Mariadorf between 2003-2009. He later joined Bayer 04 Leverkusen's youth academy in 2010.
Havertz received his first experience in football at the age of four when he joined amateur club Alemannia Mariadorf, where his grandfather, Richard, was chairman of the club. In 2009, he was signed by 2. Bundesliga club Alemannia Aachen where he spent only a year in the club's academy before joining Bayer Leverkusen at the age of 11. In the years that followed, he had to overcome the challenges associated with growth spurts and in 2016, after scoring 18 goals for the club's U-17 team, he was awarded the silver U-17 Fritz Walter Medal before breaking into Leverkusen's senior team the following year.
Havertz made his debut for the Germany national under-16 team on 11 November 2014, starting in the friendly match against the Czech Republic before being substituted out in the 57th minute for Tom Baack. The match finished as a 3–1 win for Germany.
Havertz made his debut for Bayer Leverkusen on 15 October 2016, coming on as a second-half substitute for Charles Aránguiz in a 2–1 Bundesliga loss to Werder Bremen. Upon entering the field of play, he became the club's youngest-ever Bundesliga debutant, at the age of 17 years and 126 days, although his record was broken (by 111 days) by Florian Wirtz in 2020. On 17 February 2017, he assisted teammate Karim Bellarabi to score the 50,000th Bundesliga goal. Four days later, following the suspension of teammate Hakan Çalhanoğlu, he was handed his first Champions League start in the first leg of a round of 16 loss to Atlético Madrid. He was ruled out of the return leg of the fixture in March, however, as the match clashed with the examinations period at his school. He scored his first goal for the club on 2 April, netting a later equaliser in a 3–3 draw with VfL Wolfsburg. Upon doing so, Havertz broke another club record to become Leverkusen's youngest-ever goalscorer in the Bundesliga, at the age of 17. He ultimately made 28 appearances across all competitions and scored four goals, including a brace against Hertha BSC on the final day of the season, as Leverkusen ended the campaign in 12th position.
Following a 15-month absence from youth internationals, Havertz made his debut for Germany's under-19 team, debuting on 31 August 2017 in the 0–0 friendly draw against Switzerland, coming on in the 72nd minute for Palkó Dárdai. On 4 October 2017, in his third appearance for the under-19 team, Havertz scored four goals in a 5–1 win against Belarus in the first round of European Under-19 Championship qualifying. He was later named captain of the under-19 team.
On 14 April 2018, Havertz became the youngest player in the history of the Bundesliga to reach 50 appearances at 18 years and 307 days old, breaking the record previously held by Timo Werner. He went on to end his second full campaign with the club with 30 league appearances and three goals to his name as Leverkusen ended the season in fifth place.
Havertz continued to impress during the following season, despite Leverkusen initially struggling in the league, and by the mid-way point of the campaign was the only player to have started every match for the club, scoring six goals along the way. On 20 September 2018, Havertz scored his first two goals in European competitions in a 3–2 win against Ludogorets Razgrad in the 2018–19 UEFA Europa League. On 26 January 2019, he became Leverkusen's youngest-ever penalty scorer when he scored from the spot in a 3–0 league win over Wolfsburg, aged 19 years, seven months and 16 days. The following month, he became the second youngest-ever player to achieve 75 Bundesliga appearances, behind Julian Draxler, when he started and scored in a 2–0 win over Fortuna Düsseldorf. On 13 April, he scored on his 100th appearance for Leverkusen to help the club to a 1–0 league win over Stuttgart. The goal, his 13th for the campaign, also saw him become the youngest player since Stuttgart's own Horst Köppel in 1967–68 to score 13 goals in a single league season. On 5 May, he scored his 15th goal of the campaign during a 6–1 win over Eintracht Frankfurt; a match which for the first time ever saw seven goals scored in the first half of a Bundesliga match. On the final day of the season, he became the highest scoring teenager in a single Bundesliga campaign when he scored his 17th goal during a 5–1 win over Hertha BSC. At the end of the season, he was named runner-up to Marco Reus for the German Footballer of the Year award, losing out by just 37 votes.
On 29 August 2018, Havertz was called up to Germany's senior team for the first time by head coach Joachim Löw. He was included in the squad for Germany's UEFA Nations League match against France and friendly against Peru. Havertz made his international debut on 9 September 2018, coming on as a substitute in the 88th minute for Timo Werner against Peru, with the match finishing as a 2–1 home win for Germany. Upon making his debut, he became the first player born in 1999 to represent the national team.
On 4 September 2020, Havertz signed a five-year contract with Premier League club Chelsea. The transfer fee was reported to be worth an initial £62 million, which could rise to £71 million with add-ons, making him Chelsea's second-most expensive signing after Kepa Arrizabalaga. On 14 September, he made his debut with Chelsea in the league opener against Brighton & Hove Albion, which ended in a 3–1 away win. On 23 September, Havertz scored his first career hat-trick and his first Chelsea goals in a 6–0 home win over Barnsley in the third round of the EFL Cup. Havertz scored his first-ever Premier League goal against Southampton on 17 October, in a 3–3 draw at home. On 4 November 2020, it was revealed that Havertz had tested positive for COVID-19.
Currently, Kai Havertz is 22 years, 1 months and 18 days old. Kai Havertz will celebrate 23rd birthday on a Saturday 11th of June 2022.
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