The NHL has launched an investigation into the Dallas Stars for a potential CBA violation of holding an optional practice during the holiday break.

The Stars are reportedly under NHL investigation over concerns of a collective bargaining agreement violation.

Stars coach Pete DeBoer said that Dallas' young players practiced Thursday during a mandated NHL off day and that they were "supposed to."

Dallas Stars forward Mason Marchment was helped off the ice during Friday night's game against the Minnesota Wild and taken to a hospital after being hit in the face by a puck

Stars forward Mason Marchment was helped off the ice late in the first period of Friday night’s game against the Minnesota Wild after being hit in the face by a puck. Marchment was stationed near the crease during a Dallas power play when a shot by Evgenii Dadonov from near the blue line was redirected by Logan Stankoven and struck Marchment just below his visor.

Stars forward Mason Marchment was hit in the face by a puck in the first period of Friday's game against the Wild, and the team said he would not return.