Jeffrey is scoreless in six games this season, but he still might be dealing with the effects of March surgery to repair torn ligaments in his right knee.
Bylsma told the Pittsburgh Tribune-Review that the conditioning assignment was not performance based; rather, it's because Jeffrey needed to get into game situations that weren't available when the Penguins were a fully healthy team.
He's only 17 but he can see the ice so well and he moves the puck and goes to the open ice all the time, so I just think he's a player that is ready to play in the NHL. I'm really looking forward to coaching someone like this.
— U.S. National Junior Team coach Ron Wilson on Auston Matthews, the projected No. 1 pick of the 2016 NHL Draft