MacKenzie Entwistle is expected to be out 4-6 weeks because of an injury to his left ankle, sustained during a 2-1 overtime win against the Predators on Sunday. The forward was placed on long-term injured reserve Tuesday.
Entwistle has scored three points (two goals, one assist) in 12 games this season.
"You finally get your chance, and he's worked hard to get to this level, for something like that to happen, it's kind of a step back for him," Blackhawks coach Derek King said. "I feel for him, but injuries like that, they take a little bit. But when he comes back, hopefully he's stronger and ready to go and he'll take off running again."
The Blackhawks recalled forward Reese Johnson from Rockford of the American Hockey League on Monday, and he could play against the Pittsburgh Penguins on Tuesday (8:30 p.m. ET; TVAS, NBCSCH, ATTSN-PT, ESPN+, NHL LIVE). -- Tracey Myers