Penguins' Matheson out 'longer-term' with upper-body injury

Pittsburgh Penguins defenseman Mike Matheson will be out "longer-term" with an upper-body injury, head coach Mike Sullivan revealed Sunday. There's currently no timeframe for his return to the lineup, Sullivan added.

The 26-year-old was injured during the Penguins' second game of the season against the Philadelphia Flyers and was a late scratch for Sunday's contest. Defenseman Juuso Riikola took his spot in the lineup.

Matheson averaged 15:52 minutes of ice time over the two games he's appeared in.

Pittsburgh acquired Matheson along with Colton Sceviour in exchange for Patric Hornqvist during the offseason.