Gabe Vilardi of the Windsor Spitfires will miss the Los Angels Kings upcoming rookie camp and training camp.
The club has announced its 2017 first-round pick is out with a back sprain.
General Manager Rob Blake says there's no timetable for Vilardi's return.
"Gabe has already begun his rehabilitation and continues to work hard," Blake told the Kings' website. "The injury is something that flared up throughout the summer."
Vilardi will continue to be evaluated as he goes through a rehabilitation program.