Cincinnati Bengals offensive coordinator Brian Callahan, right, talks with quarterback Joe Burrow on the field before an NFL football game against the Jacksonville Jaguars, Monday, Dec. 4, 2023, in Jacksonville, Fla. (AP Photo/Phelan M. Ebenhack)

FILE - Cincinnati Bengals offensive coordinator Brian Callahan, right, talks with quarterback Joe Burrow on the field before an NFL football game against the Jacksonville Jaguars, Dec. 4, 2023, in Jacksonville, Fla. The Tennessee Titans have agreed to hire Callahan as their head coach, a person familiar with the decision told The Associated Press on Monday, Jan. 22, 2024. (AP Photo/Phelan M. Ebenhack, File)

Cincinnati Bengals head coach Zac Taylor, left, stands on the field with offensive coordinator Brian Callahan, right, before an NFL football game against the Seattle Seahawks, Sunday, Sept. 8, 2019, in Seattle. (AP Photo/Stephen Brashear)

Cincinnati Bengals head coach Zac Taylor, left, stands on the field with offensive coordinator Brian Callahan, right, before an NFL football game against the Seattle Seahawks, Sunday, Sept. 8, 2019, in Seattle. (AP Photo/Stephen Brashear)

Cincinnati Bengals offensive coordinator Brian Callahan arrives to the stadium before an NFL football game against the Jacksonville Jaguars, Monday, Dec. 4, 2023, in Jacksonville, Fla. (AP Photo/Phelan M. Ebenhack)

Quarterbacks coach Brian Callahan, second from left, talks with quarterbacks Jake Rudock (14), Matthew Stafford (9), and Dan Orlovsky (8) during NFL football training camp Sunday, July 31, 2016, in Allen Park, Mich. (AP Photo/Duane Burleson)

Denver Broncos quarterback Peyton Manning (18), right, in a walking boot, watches pregame warm ups with offensive assistant Brian Callahan prior to kickoff against the New England Patriots in the NFL game at Denver,CO. November 29, 2015. (Eric Bakke via AP)

Denver Broncos quarterback Peyton Manning (18), right, in a walking boot, watches pregame warm ups with offensive assistant Brian Callahan prior to kickoff against the New England Patriots in the NFL game at Denver,CO. November 29, 2015. (Eric Bakke via AP)

Injured Denver Broncos quarterback Peyton Manning (18), center, talks with Brock Osweiler (17) while watching pregame warm ups with offensive assistant Brian Callahan,left,prior to kickoff against the New England Patriots in the NFL game at Denver,CO. November 29, 2015. (Eric Bakke via AP)

Detroit Lions quarterback coach Brian Callahan and quarterback Matthew Stafford (9) during practice at the Detroit Lions training facility on Thursday, Oct. 5, 2017 in Allen Park, Mich. (Detroit Lions via AP)

Detroit Lions quarterback Matthew Stafford (9) and quarterbacks coach Brian Callahan at voluntary OTA practice on Tuesday, June 7 2016 in Allen Park, Mich. (Detroit Lions via AP)

Detroit Lions quarterback coach Brian Callahan and quarterback Matthew Stafford (9) during practice at the Detroit Lions training facility on Thursday, Oct. 5, 2017 in Allen Park, Mich. (Detroit Lions via AP)

Detroit Lions quarterbacks coach Brian Callahan during OTA practice at the Detroit Lions training facility on Tuesday, June 6, 2017 in Allen Park, Mich. (Detroit Lions via AP)

Detroit Lions quarterback coach Brian Callahan at practice on Friday, May 6, 2016 in Allen Park, Mich. (Detroit Lions via AP)