Michigan football coach Brady Hoke says his team is healthy, save for a couple "boo-boos," heading into the final two practices of the spring.

That's good news for a team that lacks depth at several key positions, especially along the offensive and defensive lines.

One player that has been nicked up, though, is reigning leading tackler Kenny Demens. The senior linebacker, who also suffered a reported arm injury earlier in camp, was held back in workouts Saturday and Tuesday with a mild concussion.

Hoke said he does not think the injury is serious, and Demens is not expected to miss the spring game Saturday at Michigan Stadium.

"Kenny will tell ya, 'I probably could have gone,' but we're trying to be like we should — very cautious — with those things," Hoke said.

While Demens sat out full-contact drills, freshman Joe Bolden got some repetitions with the first team. How did the 18-year-old look?

"It was really probably a great indoctrination for a young guy," Hoke said, smiling.

"But it's been good. Him and (fellow early enrollees) Kaleb (Ringer) and Jarrod (Wilson), I'm real proud of how they made the transition. When you think about it, they'd be going to prom. ... That part of it is good, to have those reps for (Bolden)."

The only player ruled out for the spring game so far is defensive lineman Nathan Brink, who is recovering from a leg injury he suffered during Sugar Bowl workouts last year. The junior has participated in individual drills during camp but was held out of full-contact situations, Hoke said.

Receiver Jerald Robinson, who is vying for the third wideout spot, has battled an separated shoulder in camp but has played through it and is a full-go for Saturday.

"He has done a nice job," Hoke said. "I’m excited about him. "

Other than that, Michigan is mostly healthy. As a preventative measure, Hoke will limit snaps for some of his regulars in the spring game, including starting left tackle Taylor Lewan and tailback Fitz Toussaint.

They are entrenched starters with little to prove, and both were a little beat up by the end of last season. Limiting their activity helps ensure Michigan exits spring with a clean bill of health at two critical positions.

That's especially important for Lewan, a 6-foot-8-inch, 308-pound junior who is Michigan's best offensive lineman. He has the important job of protecting quarterback Denard Robinson's blind side, and his backups are walk-ons.

The Wolverines need him healthy.

"We're not going to run Fitz 30 times, and Taylor's not going to play 60 plays," Hoke said. "That's not going to happen.

Kyle Meinke covers Michigan football for AnnArbor.com. He can be reached at 734-623-2588, by email at kylemeinke@annarbor.com and followed on Twitter @kmeinke.