The Boston Bruins opened up their domestic training camp Thursday morning at Warrior Ice Arena and it did not start off the way that they would have hoped.

Veteran forwards Patrice Bergeron (back) and Noel Acciari (sports hernia), along with defenseman Torey Krug (ankle) will all be sidelined with injuries for at least Friday’s on-ice training session and potentially longer as no timetable has been set for their return(s).

Bergeron, who has been working all offseason to recover from groin and ankle injuries, stated that he has been suffering from back spasms for the past week and has been limited in the gym and on the ice. This is the third straight season that he has suffered an early-season setback; a trend that Bergeron, at age 33, hopes does not continue.

“I am not a full go for tomorrow. Dealing with some back spasms right now, so a little bit of a setback that way, but I’m still shooting for the same schedule for the end of camp and start of the season. [A] little bit of a setback, but otherwise I’m kind of looking forward to being done with them and feeling good next week,” Bergeron said about his ongoing injuries.

“I’m getting older as a hockey player but I still feel that I am taking care of my body the right way. It’s frustrating and I’m not happy that it’s happening but with that being said I’m being smart about it and not rushing anything.”

While he spends the next few days rehabbing his back, both Bergeron and the Bruins organization are hopeful that he will be fully ready to go for the season opener against the defending Stanley Cup champion Washington Capitals on Wednesday, Oct. 3 in the nation’s capital.

Bergeron’s health is something that will be kept under a microscope this season, as it is not only pivotal to Boston’s team success, but also to his individual accolades. The Bruins’ alternate captain has played a total of 963 games in his career and expects to reach the 1,000-game milestone this season, something that only 315 players have accomplished in NHL history.

“He’ll be working closely with the medical staff to monitor that situation. Hopefully, he’ll get in an exhibition game or two and be ready by the start of the season,” Bruins assistant coach Joe Sacco said.

Krug and Acciari are in similar situations as Bergeron as neither are likely to take the ice this week.

“Same thing as Krug, Acciari’s timeline hasn’t changed and he won’t be practicing the next couple of days with us,” Sacco said. “Hopefully he’ll be ready for the start of the season as well.”

Despite the multitude of early injuries, the Bruins will be back on the ice Friday and Saturday for a pair of training sessions before squaring off against Washington in their first preseason game at 1 p.m. on Sunday at TD Garden.