The Boston Bruins received both good and bad news on the injury front during the team's morning skate at Warrior Ice Arena Tuesday.

Forward Patrice Bergeron started Tuesday's practice -- centering Boston's top line alongside Brad Marchand and Anders Bjork -- but NBCSports Boston's Joe Haggerty noted that Bergeron left the skate early and did not return.

Following practice, Bruins head coach Bruce Cassidy reported that Bergeron is dealing with a lower-body injury and is currently listed as day to day -- adding that "We'll see where he's at tomorrow."

Bergeron dealt with a sports hernia for most of the 2016-17 season -- finishing the campaign with 21 goals and 32 assists over 79 games. The 32-year-old forward underwent surgery to treat the hernia on May 8, adding in August that he'd be back up to speed once training camp opened up.

While Bergeron went down with an injury, Boston gained another top player on their blue line, as defenseman Torey Krug skated in Tuesday's practice less than two weeks after fracturing his jaw during a preseason game against Detroit on Sept. 19.

.@ToreyKrug on the ice for practice at Warrior Ice Arena this morning. 😀 pic.twitter.com/HJeZksOGaZ — Boston Bruins (@NHLBruins) October 3, 2017

Krug, who took part in practice while wearing a red non-contact jersey, was originally slated to miss three weeks due to his injury.

While the Bruins have backups in place for Krug in defenseman such as Matt Grzelcyk, Rob O'Gara and Paul Postma, CBS Boston's Matt Kalman tweeted that Bruins general manager Don Sweeney has not ruled Krug out for Thursday's season opener against Nashville.

Krug, who missed the entire 2017 postseason with an MCL injury, was a productive playmaker on the blue line last year -- tallying eight goals and 43 assists over 81 games.