The San Jose Sharks defenseman is facing discipline for an illegal check to the head on Los Angeles Kings forward Austin Wagner on Saturday.
The incident occurred in the neutral zone at 2:35 of the second period of the Kings' 3-2 overtime win at SAP Center. Karlsson did not receive a penalty on the play. Wagner sustained an upper-body injury.
The following grounds are being considered for supplemental discipline: illegal check to the head. However, the Department of Player Safety retains the right to make adjustments to the infraction upon review.