Where does the banged up Penguins defense go from here?

Photo by Jeanine Leech/Icon Sportswire via Getty ImagesLast night the Penguins had to dig deep with a depleted bench, as two defensemen suffered injury in the second period of the game against the Capitals.

Coach Sullivan on Pettersson and Riikola: "Those guys are both being evaluated with upper-body injuries. I don't have an update for you right now."

— Pittsburgh Penguins (@penguins) January 20, 2021 Add Pettersson and Riikola to Mike Matheson — who was injured in the second game of the season and placed on injured reserve — and the Pens have now suffered three injuries to left handed defensemen, through just one week and four games of the season. The Penguins have used four different…