Michael's injury is the reason the Seahawks re-signed rookie running back Demitrius Bronson, who was released earlier this week. The team waived guard Greg Van Roten to make room for Bronson to return.
"He pulled up a little bit [Tuesday] in practice," Seahawks coach Pete Carroll said of Michael, "so we're ensuring we have enough guys to run the football [adding Bronson]. He did a really nice job while he was here, but the numbers caught him and we're glad to have him back.”
Receiver Percy Harvin was not at practice for the second consecutive day, but Carroll said he was excused for personal business.
Cornerback Jeremy Lane and tight end Cooper Helfet are not expected to play Thursday. Lane has what Carroll described as a mild groin strain. Helfet has a bruised shoulder and Carroll said he was day-to-day.
Rookie defensive tackle Jimmy Staten has returned to practice after missing all of training camp with a hamstring injury, but Carroll said Staten will not make the trip to Oakland.
Defensive tackle Tony McDaniel did not practice this week. Carroll said McDaniel has a sore knee that they are resting.
Receiver Bryan Walters, who missed the Chicago game with bruised ribs, is expected to play at Oakland.