Helsingborg During the summer of 2013, he played with
USL Premier Development League side
Ventura County Fusion while still enrolled in college. He appeared in 5 games for the Fusion, scoring once. After receiving an invitation to train with the Swedish
Allsvenskan side
Helsingborgs IF later that summer, Boateng paid for his airplane ticket across the
Atlantic Ocean to be able to visit the club. He made a big impression and soon thereafter they signed him to a three-and-a-half-year contract in July 2013. He would appear in 37 Allsvenskan matches over his three seasons with the club, scoring 4 times in the league. He also helped the club reach the
Svenska Cupen final in 2014, scoring two goals in five appearances, and came on as a second-half substitute in the final itself; a 0–1 defeat to
IF Elfsborg on 18 May.
LA Galaxy Boateng was transferred to
LA Galaxy of
Major League Soccer in January 2016. He made his debut against the
Colorado Rapids on 12 March 2016, where he replaced
Mike Magee, but was unable to save the Galaxy from a 1–0 loss. He scored his first goal for the club on 23 April 2016 against
Real Salt Lake, helping the Galaxy to a 5–2 victory, while also notching two assists. This performance earned him Player of the Week honors. Boateng scored his second goal of the season on 7 September, the first goal of a 3–3 draw at RSL. During the
2016 MLS Cup Playoffs, in LA's knockout round match against
Real Salt Lake, Boateng fouled
Javier Morales, conceding a penalty which was successfully taken by
Joao Plata to tie the game at 1. However, Boateng atoned for his mistake by scoring two goals within eight minutes, leading Galaxy to a 3–1 win. After the game, teammate
Landon Donovan compared Boateng's first goal to
Lionel Messi, saying that "he has that in him", while manager
Bruce Arena described his performance as an "excellent, break out game". Boateng's contract with LA Galaxy concluded at the end of their 2018 season. Boateng re-signed with Galaxy on 14 January 2019.
D.C. United On 7 August 2019, Boateng was traded to
D.C. United in exchange for $250,000 of Targeted Allocation Money. He made his first appearance for DC United in a game against the
Vancouver Whitecaps FC on 17 August 2019, subbing in for
Leonardo Jara in 67th minute. His 2020 option was exercised by D.C. United after the
2019 season.
Columbus Crew On 14 August 2020, Boateng was traded to the
Columbus Crew in exchange for
Axel Sjöberg, reuniting him with former
LA Galaxy teammate
Gyasi Zardes. He made his debut on 20 August 2020, coming on as a substitute in a 3–0 win over the
Chicago Fire. Later that season, he won the
2020 MLS Cup with Columbus. His fellow Ghanaian compatriots
Jonathan Mensah and
Harrison Afful played the full 90 minutes though. Columbus declined their contract option on Boateng following their 2020 season.
New England Revolution On 7 January 2021, Boateng signed with
New England Revolution as a free agent. Following the 2022 season, New England opted to decline his contract option. He re-signed with the club to a one-year contract on 24 February 2023, and again for an additional year on 2 January 2024.
San Diego FC On 6 January 2025, Boateng was traded from New England to expansion side
San Diego FC in exchange for $200,000 in general allocation money. He scored a goal in a 6–0 preseason friendly victory over
New York Red Bulls on 16 February ahead of the team's
inaugural season. ==Personal life==