ANN ARBOR, Mich. — Ahead of the No. 19 Michigan football team's top-20 showdown with No. 14 Iowa, Wolverines coach Jim Harbaugh offered updates on several injured players. Overall, Michigan is still experiencing relatively solid health for a team entering the sixth week of the season, but plenty of players were listed by Harbaugh as unlikely to play Saturday.

Chief among them is starting middle linebacker Josh Ross, who was listed as doubtful for the game with an unspecified leg injury. Last week, Ross was seen walking around Schembechler Hall with a cast midway up his leg, and was replaced by Cameron McGrone and Jordan Anthony in Saturday's 52-0 win over Rutgers.

"Cam McGrone, really good," Harbaugh said Monday. "I think Kwity Paye, if you had to single out one person on the defense to give a game ball to, it'll be Kwity Paye. If there was an honorable mention category or a second game ball to be given out, it would be Cam McGrone. He took another step in everything. Physical play, eye discipline, tackling, pressure on the quarterback, blitz pattern has been really good. The speed keeps showing up. Really good."

Also doubtful, for the second week in a row, is backup quarterback Dylan McCaffrey. The redshirt sophomore suffered a concussion in the third quarter of Michigan's 35-14 loss at Wisconsin. He missed last Saturday's game, but the Wolverines saw their first extended action of redshirt freshman Joe Milton's career.

Milton scored a rushing touchdown and a passing touchdown on 3-for-4 passing, earning the praise of Harbaugh.

"Joe was good," Harbaugh said. "He's gotta feel, coming out of the game, good about himself. We feel good about the way he played. He's had some consecutive good weeks of practice, had another good one today. I thought he played really well. The touchdown throw was really good."

One player who could return sooner than expected is senior tight end Sean McKeon. Appearing to hyperextend his knee when scoring a touchdown against the Badgers, McKeon missed last week's game. Harbaugh didn't list him as probable, but suggested that McKeon could be inching toward a return.

"His rehab is coming along faster than we first expected," Harbaugh said. "We'll see."

Elsewhere, Michigan's health appears to be improved from its last challenge against a. ranked opponent two weeks ago. Harbaugh said that Donovan Peoples-Jones "looked more toward 100 percent" after suffering a high-ankle sprain in fall camp.

Running back Tru Wilson said Monday that he is "full go" and increasingly able to produce at running back after suffering a broken hand. Wide receiver Nico Collins, according to Harbaugh, missed multiple practices last week due to strep throat. Defensive tackle Michael Dwumfour also returned from an apparent hand injury, aiding the Wolverines' pass rush in their blowout win.