On January 2, 2019, Pulisic signed with Premier League club Chelsea for an estimated £58 million transfer fee.
The deal also saw him stay at Dortmund on loan for the remainder of the 2018–19 season.
This transfer made Pulisic the most expensive American player and Borussia Dortmund's second-most-expensive sale of all time, behind Ousmane Dembélé.
Upon his arrival in the summer, he spoke of his desire to replicate the form shown by Eden Hazard and described the forward as a soccer idol.

Reports stated that Pulisic planned to cut his summer holidays to participate in the pre-season and impress the new Chelsea manager, Frank Lampard.
On August 11, 2019, Pulisic made his Premier League debut for Chelsea in a 4–0 defeat against Manchester United.
Pulisic scored his first goals for Chelsea on October 26, 2019, completing a "perfect" hat-trick in a 4–2 away win against Burnley.
The hat-trick was the first of his career, and he became the second American to achieve the feat in the Premier League after Clint Dempsey for Fulham in 2012, as well as the youngest hat-trick scorer in Chelsea's history at the age of 21.
He also became the first Chelsea player to score a perfect hat trick since Didier Drogba in 2010.
Pulisic scored in his next two league outings, a 2–1 away victory against Watford and a 2–0 home win over Crystal Palace.
He scored his first Champions League goal for Chelsea in a 2–2 draw away to Valencia on November 27, 2019.

When the Premier League fixtures resumed after the lockdown due to the COVID-19 pandemic, Pulisic had recovered from injury and came off the bench to score the equalizer in Chelsea's 2–1 win against Aston Villa on June 21, 2020.
In the following match, Pulisic scored the first goal in Chelsea's 2–1 victory over Manchester City, a result that eliminated City's chance of winning the league title and confirmed Liverpool as champions.
On August 1, he scored the opening goal in the 2020 FA Cup Final against Arsenal after five minutes, becoming the first American player to score in the final of the competition, but was later substituted early in the second half after sustaining a hamstring injury; Arsenal eventually came from behind to win the match 2–1.

In August 2020, Pulisic was named to the eight-player shortlist for the inaugural Premier League Young Player of the Season award, which was eventually awarded to Liverpool's Trent Alexander-Arnold.
On January 2, 2019, Pulisic signed with Premier League club Chelsea for an estimated £58 million transfer fee. The deal also saw him stay at Dortmund on loan for the remainder of the 2018–19 season. This transfer made Pulisic the most expensive American player and Borussia Dortmund's second-most-expensive sale of all time, behind Ousmane Dembélé. Upon his arrival in the summer, he spoke of his desire to replicate the form shown by Eden Hazard and described the forward as a soccer idol.
Reports stated that Pulisic planned to cut his summer holidays to participate in the pre-season and impress the new Chelsea manager, Frank Lampard. On August 11, 2019, Pulisic made his Premier League debut for Chelsea in a 4–0 defeat against Manchester United. Pulisic scored his first goals for Chelsea on October 26, 2019, completing a "perfect" hat-trick in a 4–2 away win against Burnley. The hat-trick was the first of his career, and he became the second American to achieve the feat in the Premier League after Clint Dempsey for Fulham in 2012, as well as the youngest hat-trick scorer in Chelsea's history at the age of 21. He also became the first Chelsea player to score a perfect hat trick since Didier Drogba in 2010. Pulisic scored in his next two league outings, a 2–1 away victory against Watford and a 2–0 home win over Crystal Palace. He scored his first Champions League goal for Chelsea in a 2–2 draw away to Valencia on November 27, 2019.
When the Premier League fixtures resumed after the lockdown due to the COVID-19 pandemic, Pulisic had recovered from injury and came off the bench to score the equalizer in Chelsea's 2–1 win against Aston Villa on June 21, 2020. In the following match, Pulisic scored the first goal in Chelsea's 2–1 victory over Manchester City, a result that eliminated City's chance of winning the league title and confirmed Liverpool as champions. On August 1, he scored the opening goal in the 2020 FA Cup Final against Arsenal after five minutes, becoming the first American player to score in the final of the competition, but was later substituted early in the second half after sustaining a hamstring injury; Arsenal eventually came from behind to win the match 2–1.
In August 2020, Pulisic was named to the eight-player shortlist for the inaugural Premier League Young Player of the Season award, which was eventually awarded to Liverpool's Trent Alexander-Arnold.
Christian Pulisic