Erat, acquired from the Nashville Predators along with Michael Latta for top prospect Filip Forsberg on Wednesday, was injured when he was hit into the boards by Florida defenseman Erik Gudbranson. After staying on the ice for a few minutes, Erat needed help to get to the dressing room and couldn't put weight on his right leg.
Gudbranson was assessed a five-minute penalty and a game misconduct on the play.
Erat was not on the Capitals' bench at the start of the second period. His return is questionable, according to a team spokesman.
When we started our journey we made a commitment to our fans to be relevant and to see the Chicago Blackhawks become the best professional hockey organization. There are not two finer symbols of that than Jonathan Toews and Patrick Kane. The commitment we have made to these incredible young men is equal to the commitment they have made to our team, our fans, our entire organization and the city of Chicago.
— Chicago Blackhawks owner Rocky Wirtz on signing Jonathan Toews and Patrick Kane to contract extensions