"'Sid' did skate this morning and he's in the process of rehabbing," head coach Mike Sullivan said. "We'll leave it at that."
Sullivan did not reveal Crosby's availability for Game 5 of the Second Round series, which takes place Saturday night at Verizon Center in Washington, D.C., saying only, "It's a day-to-day process and we're taking each day as it comes."
Crosby suffered the concussion in Game 3 of the Pens' Second Round series against the Capitals following a pair of head blows from Washington's Alex Ovechkin and Matt Niskanen.
Crosby missed Pittsburgh's 3-2 Game 4 victory on Wednesday night at PPG Paints Arena. He also missed seven games at the beginning of the 2016-17 season with a concussion.
