Kliff Kingsbury looks set to train the USC Trojans.

Four years after he accepted the offensive coordinator job at USC before taking over as head coach with the arizona cardinalsKingsbury will accept a role working with quarterbacks under Lincoln Riley, according to multiple reports.

USC head coach Lincoln Riley holds his daughter's hand as he walks off the field after the Trojans beat Notre Dame at the Coliseum on November 26, 2022 in Los Angeles.

USC head coach Lincoln Riley holds his daughter’s hand as he walks off the field after the Trojans beat Notre Dame at the Coliseum on November 26, 2022 in Los Angeles. (Gina Ferazzi/Los Angeles Times via Getty Images)

In December 2018, Kingsbury was hired by then-head coach Clay Helton as the Trojans’ offensive coordinator. Just a month later, Kingsbury left USC to become an NFL head coach.

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In four years in Glendale, Ariz., Kingsbury went 28-37, made the playoffs once before being fired in january.

He will return to college play to coach the current Heisman Trophy winnerCaleb Williams, who will return for his junior season.

Kingsbury, a college quarterback, has worked with elite quarterbacks at the college level, Training Patrick Mahomes at Texas Tech and Johnny Manziel at Texas A&M.

Caleb Williams of the USC Trojans looks to pass during the PAC-12 Championship football game against the Utah Utes at Allegiant Stadium on December 2, 2022 in Las Vegas.

Caleb Williams of the USC Trojans looks to pass during the PAC-12 Championship football game against the Utah Utes at Allegiant Stadium on December 2, 2022 in Las Vegas. (Alika Jenner/Getty Images)

With the Cardinals, Kingsbury coached kyler murraywho won the Heisman in 2018.

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«Lincoln has been looking for ways to explore how to improve,» a source with knowledge of the situation told ESPN. «Lincoln is 100% focused on doing everything possible to improve his team, and this is an example of that.»

Riley is entering his second season in Los Angeles, leading USC to a seven win improvement in his first season with the Trojans.

While Riley’s offense thrived, the defense struggled, finishing near the bottom of the FBS in yards allowed per game (415.1 yards).

Arizona head coach Kliff Kingsbury before a Falcons game on January 1, 2023, at Mercedes-Benz Stadium in Atlanta.

Arizona head coach Kliff Kingsbury before a Falcons game on January 1, 2023, at Mercedes-Benz Stadium in Atlanta. (Rich von Biberstein/Icon Sportswire via Getty Images)

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On Saturday, Riley praised his defense as the Trojans wrapped up their 11th spring practice.

«Defensively, last year there was a little bit of the feeling that you had a bunch of really good guys and then there was just too much of a gap between those guys and everybody else,» Riley explained, according to the Trojans’ website. «Whereas, now that you have some really good, outstanding individual players, but the gap is closed, and because of that they have more competition, more depth.»