First year Texas Tech coach Kliff Kingsbury, hired in December, finalized and signed his contract Monday.

It is a five-year deal worth $10.5 million that could be worth up to $13.5 million depending on bonuses, according to a source.

Originally, the school had said Kingsbury would sign a four-year deal that averaged $2 million a year.

The 33-year-old Kingsbury never has been a head coach. He's the youngest head coach of a BCS school and the second-youngest in the Football Bowl Subdivision behind Toledo's Matt Campbell.

Kingsbury was Texas A&M's offensive coordinator and quarterbacks coach. He instructed Heisman Trophy winner Johnny Manziel this season.

During his introduction, Kingsbury wasn't ready to reveal what sort of offense fans will see. He said the program is "not broken" despite back-to-back seasons where the Red Raiders slid down the stretch. This year, they lost four of their last five games, and in 2011, they dropped five straight to close the season for the program's first losing season since 1992.

"I'm more of a walking-type guy, not a talking-type guy, so I'll let you all see that in the fall," he said. "But it's going to be an exciting brand of football."

Information from The Associated Press was used in this report.