Rookie Young (shoulder) undergoes testing

Young injury

WALTHAM, Mass. -- Boston Celtics rookie James Young was undergoing testing Thursday to determine the severity of a right shoulder subluxation sustained in an NBA Development League appearance Wednesday night with the Maine Red Claws.

Young injured the shoulder after absorbing contact from Drew Gordon while trying to corral a pass near midcourt late in the third quarter of a game against the Delaware 87ers. Young was attended to by a trainer on the court before walking off the floor while still clutching the right (non-shooting) shoulder.

Before the injury, Young was having a quality night with 19 points on 6-of-8 shooting (5-of-7 beyond the 3-point arc). Young added six rebounds, three assists and two steals over 24 minutes.

"I guess his shoulder subluxed and they are doing more tests to see the extent of the injury," Celtics coach Brad Stevens said after Thursday's practice. "Those can be very, very short term things, or they can be a little bit longer. That’s the extent of what I know. He’s getting X-rays right now."

Young, the 17th overall pick in June's draft, has appeared in five games for Boston playing a total of 18 minutes. With the Red Claws, he's displayed strong 3-point shooting, but has been working on his raw defense with hopes that improvements there could open doors at the NBA level.

Young only turned 19 last month and had recently embraced the idea of shuttling between the parent team and the D-League in hopes of valuable game reps.