Mark Masters reported, and Sheldon Keefe confirmed today that Dylan Gambrell suffered a concussion in yesterday's practice. As of this moment, there is no timeline for his return.
That being said, he did have some nice moments in the preseason action he did see, including this play.
Gambrell has split time between the NHL and AHL in recent years, but managed to get into 60 games with the Sens last season, putting up ten points.