Byfield (upper body) is expected to miss Thursday's game against the Islanders, per Zach Dooley of the Kings' official site.
Byfield suffered the injury during Tuesday's game against Washington. He has a goal and an assist in seven appearances this season. His absence will likely result in Jared Wright drawing into the lineup Thursday. Byfield was regarded as a game-time decision and still might be an option Saturday in New Jersey.