49ers rookie Bosa exits practice, getting MRI

Offensive linemen haven’t had much luck slowing Nick Bosa in training camp, but another injury did Wednesday.

The 49ers’ rookie edge rusher — the No. 2 pick — had an MRI on his ankle after he was caught up in a pile of several players on a running play during practice. Bosa remained on the field for several minutes before he walked off slowly with two trainers.

Defensive coordinator Robert Saleh didn’t have definitive news on Bosa’s injury when he spoke shortly after practice, but he indicated it wasn’t serious. The 49ers did not provide an update after Bosa had his MRI.

“I think he’s alright,” Saleh said. “… I don’t think there’s anything to worry about.”

However, Bosa’s injury history could be a growing concern: Before he went down in the 10th practice of training camp, he sustained a hamstring injury in his second NFL practice in May and missed the rest of the offseason program.

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Last year, Bosa played in just three games at Ohio State due to a core muscle injury that required surgery. He also sustained a torn ACL as a senior in high school.

Bosa’s brilliance has been the biggest story of the 49ers’ training camp. He set the tone for his strong summer by beating Pro Bowl left tackle Joe Staley on three snaps in his second practice.

“He’s been progressing very well,” Saleh said. “Very pleased with him. He’s got a knack for pass rush. He’s very good in the run game. At this point, he’s progressing very well and we’re all very excited about him.”

Said quarterback Jimmy Garoppolo: “He’s just a savvy rookie. To be able to play the run and pass the way he does, it’s impressive.”

The 49ers’ defensive line was thin due to injuries even before Bosa was sidelined: Arik Armstead (calf) and Ronald Blair (groin) appeared on the injury report and Dee Ford (knee) remained out.

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