Captain Sidney Crosby left the Pittsburgh Penguins' scrimmage early on Saturday and didn't return, the team announced.
Head coach Mike Sullivan declined to comment on the matter, citing the league's new rules about teams being prohibited from disclosing players' injuries or illnesses.
The reason behind Crosby's departure is unclear. The Athletic's Josh Yohe, who was in attendance, said he didn't notice anything alarming.
Pittsburgh will begin its play-in round against the Montreal Canadiens on Aug. 1.
