[2][3][4] On December 21, 2018, it was announced that Freese would leave Harvard early and join Major League Soccer club Philadelphia Union at the beginning of their 2019 season.
[5] Freese made his professional debut on April 19, 2019, coming on as a 54th-minute substitute for Andre Blake in a 3–0 home win against the Montreal Impact.
On November 8, 2020, Freese made his lone start of the 2020 season against the New England Revolution on MLS Decision Day.
[6] On January 27, 2023, Freese was traded to New York City FC in exchange for a guaranteed $350,000 of General Allocation Money, with a possibility of an additional $400,000, as well as a percentage of a future transfer fee.
Freese was named to the final 20-player United States under-23 roster for the 2020 CONCACAF Men's Olympic Qualifying Championship in March 2021.