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Ann Arbor — Injured Michigan starting quarterback Jake Rudock participated in Monday's practice and his progress surprised coach Jim Harbaugh.

Harbaugh on his radio show Monday night, said while there were a few things Rudock couldn't do, he practiced well.

"He was further along than I thought he would be," Harbaugh said.

Rudock was injured and knocked out of the Minnesota game late in the third quarter last Saturday. This week's opponent is Rutgers, which visits Michigan Stadium on Saturday (3:30 p.m., BTN).

"He got treatment," Harbaugh said earlier Monday at his weekly news conference about Rudock. "We'll see today, We'll go out and participate in practice we'll see how much he can do. He'll probably be sore, he'll probably be limited. That would be expected."

Harbaugh, who said after the game he wasn't sure but thought Rudock would be able to play against Rutgers, was asked how much Rudock has to practice this week to play Saturday.

"It depends," he said. "There's no magic formula other than that player is our best option, that player gives us the best chance to win whatever position you're talking about whether it's quarterback or cornerback. That's the test and if they're not going to injure themselves worse.

"Not only does it have to be 100 percent, sometimes it does. It just depends. And also that somebody's not going to injure themselves worse. So that would be the two criteria — how good does he have to be to play, he's not going to injure himself worse and he gives us the best option to win with a percentage of his health."

Personnel updates

Tailback Ty Isaac, who has been virtually non-existent in Michigan's running game since starting the Big Ten opener at Maryland, is not on this week's depth chart.

"It's an internal matter," Harbaugh said.

Harbaugh was asked how long Isaac might be subject to this internal matter

"I'll keep you posted," Harbaugh said. "None of your business would be another way to say it."

Isaac started at Maryland when De'Veon Smith stayed home to nurse an ankle injury, but he fumbled twice in that game, recovering one, and he also drew a penalty for roughing the kicker. Since then, Isaac had two carries for 13 yards against Northwestern and two carries for five yards against Michigan State.

Fullback Henry Poggi has a "bit of" pneumonia and missed the Minnesota game.

"Henry had to take a knee," Harbaugh said. "See if we can't boost his immune system. Some more push-ups, drink some more milk."

Defensive lineman Matt Godin also didn't play.

"He's working through a little something," Harbaugh said.

Freshman lineman plays

Mason Cole started every game at left tackle last season as freshman, and now his backup, freshman Grant Newsome, has seen action.

Newsome played some at Minnesota.

"He's physically (more) mature than most, mentally very sharp, more so than most," Harbaugh said. "He's a battler. He's tough. He hasn't taken a backseat. I know he's going to be really good and he's ready now."

Mistakes were made

Michigan struggled defending the read-option and Mitch Leidner at Minnesota, and Harbaugh insisted that wasn't because of structural errors.

"Mistakes were made," he said. "It was disappointing. We'll work to correct it but … not happy about it. It was gone over. Don't know what to attribute that to. Lack of focus or too loose, too tight, whatever, just didn't execute proper assignment."

angelique.chengelis@detroitnews.com

twitter.com/chengelis

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