Denver Broncos quarterback Case Keenum throws a pass during the first half of an NFL football game against the Los Angeles Chargers, Sunday, Dec. 30, 2018, in Denver. (AP Photo/David Zalubowski)

Minnesota Vikings quarterback Case Keenum (7) runs from New Orleans Saints defensive tackle David Onyemata (93) during the second half of an NFL divisional football playoff game in Minneapolis, Sunday, Jan. 14, 2018. (AP Photo/Jeff Roberson)

Houston quarterback Case Keenum throws a pass as he runs a drill at the NFL football scouting combine in Indianapolis, Sunday, Feb. 26, 2012. (AP Photo/Michael Conroy)

Houston Texans quarterback Case Keenum (7) warms up before an NFL preseason football game against the Minnesota Vikings, Thursday, Aug. 30, 2012 in Houston, Texas. (AP Photo/Dave Einsel)

Denver Broncos quarterback Case Keenum (4) dives in for a touchdown as Cleveland Browns outside linebacker Genard Avery (55) pursues during the first half of an NFL football game, Saturday, Dec. 15, 2018, in Denver. (AP Photo/Jack Dempsey)

In this Sept. 3, 2011, photo, Houston quarterback Case Keenum looks for a receiver during an NCAA college football game against UCLA in Houston. Keenum says he plans to sign with the Houston Texans. Keenum said Monday, April 30, 2012, the Texans have told him they will sign him. The team has not commented, but that didn't stop Keenum from talking with reporters about his future in the NFL. (AP Photo/Dave Einsel)

Minnesota Vikings quarterback Case Keenum (7) celebrates following a 29-24 win over the New Orleans Saints in an NFL divisional football playoff game in Minneapolis, Sunday, Jan. 14, 2018. (AP Photo/Charlie Neibergall)

Denver Broncos quarterback Case Keenum (4) scrambles against the Cleveland Browns during the first half of an NFL football game, Saturday, Dec. 15, 2018, in Denver. (AP Photo/Jack Dempsey)

Houston Texans wide receiver DeAndre Hopkins (10) embraces quarterback Case Keenum (7) during the second half of an NFL football game Sunday, Dec. 28, 2014, in Houston. (AP Photo/Patric Schneider)

Denver Broncos quarterback Case Keenum runs with the ball during the first half of an NFL football game against the Los Angeles Chargers, Sunday, Dec. 30, 2018, in Denver. (AP Photo/David Zalubowski)

Denver Broncos' Case Keenum (4) throws a pass during the first half of an NFL football game against the New York Jets Sunday, Oct. 7, 2018, in East Rutherford, N.J. (AP Photo/Seth Wenig)

Denver Broncos quarterback Case Keenum throws a pass during the first half of an NFL football game against the Los Angeles Chargers, Sunday, Dec. 30, 2018, in Denver. (AP Photo/David Zalubowski)