As a senior, he averaged 13 points and 5.6 rebounds per game and was named to the Third-team All-American Athletic Conference.

[1] Originally projected as a second-round pick, Jeffries went undrafted in the 2019 NBA draft.

[2] Reportedly, he declined a two-way deal in order to compete for a roster spot with the team.

On December 13, Jeffries tallied 44 points, nine rebounds and two blocks for Stockton in a victory over the Sioux Falls Skyforce.

[17] On September 15, 2022, Jeffries signed with the New York Knicks,[18] but was waived at the end of training camp.

[30] On October 2, 2024, Jeffries was signed and traded to the Charlotte Hornets in a three team trade involving the Minnesota Timberwolves in which Minnesota acquired Keita Bates-Diop, Donte DiVincenzo, Julius Randle, and one Lottery Protected first-round pick.

The Hornets also received Charlie Brown Jr., Duane Washington Jr., three second-round picks and draft compensation.