Pittsburgh Penguins star Sidney Crosby said Monday he is out indefinitely after a return of concussion-like symptoms that sidelined him for 61 games.

Crosby recently returned to the NHL on Nov. 23 and appeared to be strong, scoring two goals and adding two helpers in his season debut, after a 10-month absence.

But the 24-year-old superstar from Cole Harbour, N.S., said Monday he is once again out indefinitely after he noticed a recurrence of the symptoms last week, when the Penguins were ground down by the Boston Bruins, losing 3-1.

Crosby sat out the following two games in Philadelphia and New York as a precaution. Now, he says the concussion-like symptoms were present during light workouts over the weekend.

Crosby said the setback is frustrating, but he stressed he was being cautious and didn't want to take any chances with his recovery.

"I did my ImPACT test and it went pretty good," Crosby told reporters, referring to the athletic concussion test.

"That was a good sign. It's much different than previously going through that stuff. That was encouraging. I skated the following day after with exertion. I just didn't feel right."

The centre took a handful of hard hits during the Bruins game, and also collided with teammate Chris Kunitz. After the collision, Crosby skated to the bench in obvious pain.

"After talking with everyone I figured it was better to be cautious and not take any chances. That's where I'm at right now."