There's growing concern about Joshua Garnett's knee injury Jimmy Graham Jersey , 49ers coach Kyle Shanahan said Friday, after the guard missed the last five practices of training camp.

"Josh said that he doesn't feel right, so that's always worrisome when a player says he doesn't feel right," said Shanahan. "And I know Josh is getting a few second opinions. So waiting until our doctors talk to other people and see what conclusion they come to."

Garnett began camp in a heated competition to start at right guard after missing all of 2017 following surgery on the same right knee last August. The team said Garnett banged knees with a teammate July 28 and he was expected to return this week.

Part of the concern is the uncertainty surrounding the injury, which the team initially called "not significant."

"It depends who you talk to," Shanahan said. "That's what we're trying to find out and that's what he's trying to find out. Josh went through a lot last year with his knee."

San Francisco signed Jonathan Cooper and Mike Person in the offseason to also be in the mix at right guard.

Cooper, who had offseason knee surgery Youth Luke Kuechly Jersey , hasn't participated in full-team drills yet after returning to individual drills earlier this week. Person has been given the majority of the work with the starters while second-year player Erik Magnuson has also been involved.

NOTES: CB Richard Sherman sat out the second half of Friday's practice after feeling tightness in his hamstring, Shanahan sa6id . Rookie WR Dante Pettis was given the day off after tweaking his groin . Rookie LB Fred Warner sat out Friday after suffering a chest contusion earlier in the week . DE Jeremiah Attaochu (groin) was also given the day off . The 49ers will have the day off Saturday before returning to practice Sunday.

The matchup was a mismatch. And it ended predictably: with Pittsburgh Steelers Pro Bowl defensive end Cameron Heyward shedding Tennessee Titans rookie guard Aaron Stinnie and driving quarterback Blaine Gabbert into the ground.

Heyward popped up and turned to the Pittsburgh sideline with his palms raised after picking up his first sack of the preseason early in the second half of a 16-6 victory on Saturday.

Asked if the pose was his way of asking the coaching staff if it had seen enough, Heyward just laughed.

"No, but it was something close to that," Heyward said. "Because I should have got the sack way earlier and I was messing around."

A not uncommon sentiment for the defending AFC North champions. A week after getting pushed around a bit by Aaron Rodgers and the rest of the Packers in a lopsided loss in Green Bay, Pittsburgh's defense responded by limiting Tennessee to 52 yards in the first half and keeping them out of the end zone until well after Heyward and the rest of the first stringers had departed.

Was it the "varsity" football coach Mike Tomlin was looking for? Heyward isn't quite sure. But it's as close as it gets in August.

"We game-planned a lot more this game," Heyward said. "This is something you continue to do as preseason goes along. You start to add more and more. This was a dress rehearsal (but) it was one game. We don't put a lot of stock into it Ray Nitschke Jersey , but just a good showing."

Pittsburgh, which set a franchise record while leading the NFL with 56 sacks in 2017, never let Tennessee quarterback Marcus Mariota get comfortable.

Vince Williams, fresh off signing a new four-year contract last Thursday, took Mariota down in the first half.

So did defensive end Stephon Tuitt as the Steelers mixed and matched their defensive alignment far more frequently than they did in either of their first two preseason matchups.

"We don't show all of our cards, but that's part of the game," Heyward said. "We're putting little tidbits out there Pernell McPhee Jersey , stuff we've been working on. We'll just keep evolving. That's not something we're set with but that's part of the game. We have so many different fronts. Everybody has to be willing to play different spots and we'll be ready to go next game."

Tomlin has stressed the need for better fundamentals during training camp, particularly when it comes to tackling.

The Titans did little on the ground to take some of the pressure off Mariota. Running backs Derrick Henry and Dion Lewis combined for just 23 yards rushing.

"We are just trying to get after it," cornerback Joe Haden said. "We are just trying to make plays. As long as our communication and stuff is right, we have the talent."

Including, Haden believes, on the back end. Rookie first-round pick Terrell Edmunds showcased why the Steelers took him with the 28th overall selection, stepping in front of Mariota's pass late in the second quarter and returning it 30 yards.

Edmunds wasn't focused on his electric pick as much as the resiliency showed by the starters after Green Bay moved the ball with relative ease.

"Last week we took a bad 'L http://www.officialredwings.com/authentic-adidas-dylan-larkin-jersey ,'" Edmunds said. "We don't want to take any 'Ls' even if it is preseason. It's a big practice. It's a big open practice you could say."

There's one more to go before things start to get serious. The Steelers (2-1) finish up their exhibition schedule Thursday night against Carolina. Heyward and the rest of Pittsburgh's bold-faced names will get the night off.

For rookies such as inside linebacker Matthew Thomas 鈥?an intriguing prospect whose speed has caught the attention of the coaching staff and who ran with the starters for a handful of snaps on Saturday 鈥?it will be one last opportunity to show Tomlin they're worthy of one of the 53 roster spots. For the starters, it will be one last chance to catch their breath before the real grind begins.

"I think (Saturday) was a good stand for us to be able to have as many defensive players out there and play pretty well," Haden said.

"I think it's just the standard. This is something we want to continue to do and as long as we get more and more reps and everybody is healthy going into the season, we should be fine."

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