Earlier this summer, Celtics point guard Rajon Rondo spoke with excitement about the upcoming campaign, telling the Globe his right knee felt almost as good as it did before he suffered an injury that hindered him last season.

“I’m feeling pretty confident,” the Louisville native said during an interview in his hometown. “It’s feeling stronger. A little more explosive. My first step, I think, is almost back.”

But now Rondo’s health has taken another step back after the team announced the four-time All-Star and team captain had surgery Friday morning to repair a broken bone in his left hand.

The 28-year-old suffered the injury — a left metacarpal fracture — during a fall in his home Thursday night, the team stated in a release.

Doctors estimate that Rondo could miss 6-8 weeks, meaning he will be sidelined for at least the start of the regular season, which the Celtics open Oct. 29 against Brooklyn at TD Garden. If Rondo is out eight weeks, he could miss nearly the first full month of the season.

Rondo, Celtics president of basketball operations Danny Ainge and coach Brad Stevens are all expected to address the injury at media day Monday. The Celtics are scheduled to open training camp Tuesday and preseason Oct. 6 against Philadelphia.

The injury to Rondo’s non-shooting hand marks another obstacle, as he played 30 games last season after returning from surgery to repair a torn anterior cruciate ligament in his right knee.

Barring any moves, the Celtics have two point guard options: first-round pick Marcus Smart — their No. 6 overall selection in June’s NBA draft — and second-year guard Phil Pressey, who started 11 games last season.

Expectations were already low for a rebuilding team that didn’t improve much this offseason after posting a 25-57 mark last season, the third-worst record in franchise …read more