Young was helped back to the locker room late in the third quarter while putting minimal pressure on the joint amid a 20-point, 14-assist outing. The Hawks quickly ruled him out for the rest of the game.
After Atlanta lost in overtime, 137-127, the team announced X-rays were negative and that Young would receive an MRI on Thursday.
The 22-year-old missed one game as a result of knee soreness in early April, while injuries to his calf and adductor also limited him earlier in the year. He missed just eight games in his first two NBA seasons combined.
For the season, Young is averaging 25.4 points and 9.5 assists per game. He's helped Atlanta get back into playoff contention after finishing near the bottom of the standings the past few years, with the 32-27 Hawks currently fifth in the East.
If Young misses time—the Hawks' next game is Friday versus the Miami Heat—look for Lou Williams, Bogdan Bogdanovic and Kevin Huerter to see more time.