Pittsburgh Penguins superstar Sidney Crosby has been diagnosed with another concussion and there is no timetable for his return.

General manager Jim Rutherford made the announcement Monday as the team prepared for its regular-season opener Thursday night at home against Washington.

Coach Mike Sullivan told reporters that Crosby was concussed at practice Friday and said there is no timing for return of the two-time Stanley Cup champion and the reigning playoff MVP who led Team Canada to a World Cup of Hockey title two weeks ago.

Crosby sat out a preseason game Saturday against Columbus because he wasn’t feeling well and missed practice Monday to undergo concussion testing. The team said Crosby’s status will be updated when more information becomes available.

The 29-year-old Crosby missed significant time earlier in his career with concussion problems.

Crosby has 338 goals and 600 assists in 707 NHL games and is widely considered the best hockey player in the world. He led the Penguins to the fourth Cup in franchise history and was a finalist for the Hart Trophy with 85 points in 80 games.