Penguins coach Mike Johnston did not provide information on Letang's status following the 3-2 overtime loss.
"Any time there's a hit like that, you are always going to be cautious," Johnston said. "We'll see how he is tomorrow morning."
Letang passed the puck in the Penguins zone when Rinaldo hit Letang from behind. Letang stayed down on the ice before skating to the locker room accompanied by a member of the Penguins training staff.
Rinaldo was assessed a five-minute major for boarding and a game misconduct.
Stay Connected
NHL.TV™
NHL GameCenter LIVE™ is now NHL.TV™.
Watch out-of-market games and replays with an all new redesigned media player, mobile and connected device apps.
Introducing the new official NHL App, available for iPhone, iPad and Android smartphones and tablets. A host of new features and improved functionality are available across all platforms, including a redesigned league-wide scoreboard, expanded news coverage, searchable video highlights, individual team experiences* and more. The new NHL App on your tablet also introduces new offerings such as 60fps video, Multitasking** and Picture-in-Picture.
*Available only for smartphones
** Available only for suported iPads