Harbaugh's contract was initially set to expire after the 2018 season, however with this extension, he will now be with the Baltimore Ravens through the 2019 season.
The Ravens have struggled with injuries the last two seasons and that has continued this year with quarterback Joe Flacco yet to participate in the preseason with a back injury.
Since then, the notion has been that Flacco would be ready to go for the season opener against the Cincinnati Bengals on September 10.
MI to wear all-maize uniforms in opener vs. Florida
While talking to reporters today, Harbaugh was asked if he was ready to announce who his starting quarterback will be. The Wolverines face Florida on Saturday, Sept. 2, at AT&T Stadium in the regular-season opener for both teams .
Since the Ravens came to Baltimore in 1996, Harbaugh is just the third coach the team has had, along with Brian Billick who lead the team to a Super Bowl win in 2000, and Ted Marchibroda. It happened after the 8-8 season 2013 and after the 2015 campaign.
Harbaugh, 54, is preparing for his 10th season at the helm of the Ravens.
The biggest weakness the Ravens had previous year was on offense, and while they lost receiver Steve Smith to retirement and Kamar Aiken to free agency, they added Jeremy Maclin, who should be a solid number one receiver in their offense.