Spring practice is either over or coming to a close for a lot of college football programs. That means all the focus is on the 2021 season, and some coaches are under a lot of pressure to win this upcoming year.

CBS Sports’ Barrett Sallee recently named seven head coaches who are under the most pressure heading into the 2021 season. Three of the names on his list are from the B1G.

Per Sallee, Michigan’s Jim Harbaugh, Nebraska’s Scott Frost and Purdue’s Jeff Brohm are the three B1G head coaches most in need of good seasons this fall. All three endured losing campaigns during the pandemic-shortened 2020 season.

Success will look much different for all three programs. Michigan has enjoyed a fair amount of it under Harbaugh, but the inability to defeat Ohio State or win a division title is the knock that keeps Harbaugh from being an elite head coach at the college level.

Frost was a big-time hire for Nebraska after the 2017 season, but the Huskers have failed to post a winning record in any of his three seasons at the helm. In three years, Nebraska is just 12-20 under Frost with no bowl appearances.

Brohm’s tenure at Purdue was off to a strong start in his first two years, leading the Boilermakers to back-to-back bowl appearances and an upset of No. 2-ranked Ohio State during the 2018 campaign. However, Purdue is just 6-12 in the last two years and is now on its third defensive coordinator in five seasons.

You can view Sallee’s complete list on CBS Sports.