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Charlie Neibergall, Associated Press
Iowa head coach Kirk Ferentz, left, talks with Miami of Ohio head coach Chuck Martin before an NCAA college football game, Saturday, Sept. 3, 2016, in Iowa City, Iowa.

IOWA CITY, Iowa — Iowa has signed coach Kirk Ferentz to a six-year contract extension through the 2025 season.

Ferentz, who is in his 18th season leading the Hawkeyes, will see his salary jump to $4.5 million per year under the new deal announced Tuesday.

Ferentz's last contract, which was for 10 years at roughly $40 million, was set to expire in 2020. Ferentz's massive buyout was subject to scrutiny under his previous deal, but a 12-2 season capped with a trip to the Rose Bowl quieted that talk.

Ferentz and Oklahoma' Bob Stoops are the nation's longest-tenured coaches, having been hired within days of each other in 1999.