Phoenix Suns forward Cam Johnson was diagnosed with a torn meniscus and in his right knee and will undergo surgery, the team announced Sunday.
The Suns did not provide a timetable for his return.
The fourth-year forward injured his knee during Friday's 108-106 defeat to the Portland Trail Blazers and didn't return.
In a starting role, Johnson is averaging a career-high 13.0 points per game, 3.4 rebounds, 1.8 assists, and 1.1 steals. He's shooting a career-best 43% from deep, making 2.8 shots per game from beyond the arc.
The Suns' forward rotation is already without veteran Jae Crowder, as the team is attempting to trade the 32-year-old. The Hawks reportedly contacted Phoenix about acquiring Crowder in October.
Tied for the best record in the Western Conference, Phoenix takes on Portland on Saturday at 10 p.m. ET.