SANTA CLARA -- Not only are the 49ers expecting to practice without Michael Crabtree for the next week or two, they saw last season's team MVP and leading receiver Anquan Boldin get ejected by Jim Harbaugh for fighting late in Friday's twilight practice.

As if those events weren't jarring enough, starting nose tackle Glenn Dorsey injured his left arm midway through practice and did not return. Dorsey was examined thoroughly on the sideline by trainers, with general manager Trent Baalke closely observing.

All in all, it was the 49ers' most intense and physical practice of training camp, if not in all of Harbaugh's four seasons as coach.

The day started with Harbaugh predicting Crabtree will be out "maybe a week, maybe two," along with fellow wideout Brandon Lloyd. Crabtree apparently is coping with a sore hamstring, though Harbaugh would say only that it's not related to his surgically repaired Achilles or previously fractured feet. Lloyd's injury is unknown.

The loss of Dorsey could have the most long-term impact if it's a torn ligament or muscle. He's the starting nose tackle, and Ian Williams still hasn't practiced since last season's Week 2 ankle fracture.

But Dorsey's plight got overshadowed in the ensuing hour by the fireworks between the offense and defense.


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Harbaugh quickly intervened to break up a fight between Boldin and second-year cornerback Darryl Morris with a few minutes left in the rare, twilight practice. Not only did Harbaugh pull an irate Boldin away, but the coach escorted him to the side and sent him to the locker room.

Boldin had caught a short pass from McLeod Bethel-Thompson and then took exception to Morris' physical nature. Boldin exchanged words, threw the football at Morris, and fisticuffs ensued.

Only two more plays were run before practice ended: Chuck Jacobs caught a pass and received a late hit by Morris, followed by rookie Dontae Johnson's interception of a Bethel-Thompson pass toward Devon Wylie.

Harbaugh gathered his team for an extra-long talk after practice. Ejections have been Harbaugh's training-camp protocol when it comes to fighting: C.J. Spillman last year, and Kyle Williams and Brian Tyms in 2012.

About five minutes before the Boldin-Morris brawl, running back Jewel Hampton shoved linebacker Chase Thomas after being stopped behind the line of scrimmage. Offensive tackle Jonathan Martin and defensive tackle Quinton Dial exchanged heated words for the second time in three days but quickly made peace.

  • Harbaugh considers it "refreshing" to table his contract talks until after the season so he and others can focus on the upcoming season. "As the leader of the team, if you're running in for a contract extension every couple years, it has a tendency to send everybody else running for the water cooler," said Harbaugh, who's entering the fourth season of a five-year deal.

    CEO Jed York said Thursday that he and Harbaugh mutually agreed to wait until after this season to resume talks on extending a contract that has two years remaining. Harbaugh says he's in "lock-step" with that call.

  • Tight end Vernon Davis returned to team drills after missing Thursday's for precautionary reasons. Davis caught a touchdown pass from Colin Kaepernick to start a goal-line drill.

  • Harbaugh said Marcus Lattimore (knee) will make the club "in some form or fashion," though the second-year running back remains on the non-football-injury list. "I know what he has inside him and what he's capable of doing on the football field," Harbaugh said. Lattimore was seen Friday trying on a new brace for his right knee during individual conditioning.

  • The 49ers unveiled a Levi's Stadium's art collection of more than 500 photographs and 200 original pieces, including paintings by Liz Walsh, daughter of former 49ers coach Bill Walsh. "Mostly in all the paintings I did for this project, I really did try to embody my father's spirit in some ways," Liz said. "It's been really rewarding and really fun."

  • Kaepernick, with his father, Rick, watching from the sidelines, completed 7 of 11 passes in 11-on-11 drills, including a 50-yard bomb to Jacobs.

    For more on the 49ers, see Cam Inman's Hot Read blog at blogs.mercurynews.com/49ers. Follow him on Twitter at twitter.com/CamInman.

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