Harbaugh gave the update two days after Bell was injured in a 47-14 win over Western Michigan.
Bell had a 76-yard touchdown reception and returned a punt 31 yards before injuring his right knee in the opener.
He was the team’s leading receiver last season and was an All-Big Ten honorable mention selection in 2019. Bell, who started 17 of 33 games, has 83 career receptions for 1,380 yards and five touchdowns.
The Wolverines (1-0) hosts No. 20 Washington (0-1) on Saturday night.
The Huskies likely will fall out of The Associated Press college football poll after becoming the first ranked FBS team in five years to lose to a FCS team. They fell to Montana, 13-7.
Michigan’s Ronnie Bell out for season with knee injury originally appeared on NBCSports.com