Zach Zenner photos

Detroit Lions running back Zach Zenner (34) during a NFL football game against the Chicago Bears on Thursday, Nov. 22, 2018 in Detroit. (Detroit Lions via AP).

Detroit Lions running back Zach Zenner (34) during a NFL football game against the Green Bay Packers on Sunday, Jan. 1, 2017 in Detroit. (Detroit Lions via AP)

Detroit Lions running back Zach Zenner (34) during a NFL football game against the Green Bay Packers on Sunday, Jan. 1, 2017 in Detroit. (Detroit Lions via AP)

Detroit Lions running back Zach Zenner (34) during a NFL football game against the Green Bay Packers on Sunday, Jan. 1, 2017 in Detroit. (Detroit Lions via AP)

Detroit Lions running back Zach Zenner (34) runs for a touchdown during a NFL football game against the Green Bay Packers on Sunday, Jan. 1, 2017 in Detroit. (Detroit Lions via AP)

Lions players volunteer at Starfish Family Services

Detroit Lions running back Zach Zenner (34) runs for a touchdown during a NFL football game against the Dallas Cowboys on Monday, Dec. 26, 2016 in Arlington, Texas. (Detroit Lions via AP)

Detroit Lions running back Zach Zenner (34) during a NFL Wild Card playoff football game against the Seattle Seahawks on Saturday, Jan. 7, 2017 in Seattle. (Detroit Lions via AP)

Detroit Lions running back Zach Zenner (34) scores a touchdown during a NFL football game against the Carolina Panthers on Sunday Oct. 8, 2017 in Detroit. (Detroit Lions via AP).

Detroit Lions running back Zach Zenner (34) during a NFL football game against the Carolina Panthers on Sunday Oct. 8, 2017 in Detroit. (Detroit Lions via AP).

Detroit Lions running back Zach Zenner (34) during a NFL football game against the Carolina Panthers on Sunday Oct. 8, 2017 in Detroit. (Detroit Lions via AP).

Detroit Lions running back Zach Zenner (34) during a NFL football game against the Minnesota Vikings on Sunday, Dec. 23, 2018 in Detroit. (Detroit Lions via AP).

Detroit Lions running back Zach Zenner (34) runs for a touchdown during a NFL football game against the Green Bay Packers on Sunday, Dec. 30, 2018 in Green Bay, Wisc. (Detroit Lions via AP).

Detroit Lions running back Zach Zenner (34) during a NFL football game against the Buffalo Bills on Sunday, Dec. 16, 2018 in Orchard Park, N.Y. (Detroit Lions via AP).

Detroit Lions running back Zach Zenner (34) runs for a touchdown during a NFL football game against the Arizona Cardinals on Sunday, Dec. 9, 2018 in Glendale, Ariz. (Detroit Lions via AP).

Detroit Lions running back Zach Zenner (34) during a NFL football game against the Chicago Bears on Sunday, Nov. 11, 2018 in Chicago. (Detroit Lions via AP).

Detroit Lions running back Zach Zenner (34) during a NFL football game against the Los Angeles Rams on Sunday, Dec. 2, 2018 in Detroit. (Detroit Lions via AP).

Detroit Lions running back Zach Zenner (34) scores a touchdown during a NFL football game against the Carolina Panthers on Sunday Oct. 8, 2017 in Detroit. (Detroit Lions via AP).

Detroit Lions running back Zach Zenner (34) on special teams during a NFL football game against the Carolina Panthers on Sunday, Nov. 18, 2018 in Detroit. (Detroit Lions via AP).

Detroit Lions running back Zach Zenner (34) meets with families from Tragedy Assistance Program For Survivors (TAPS) after the team's walkthrough at the Detroit Lions training facility on Saturday, Nov. 17, 2018 in Allen Park, Mich. (Detroit Lions via AP)

Detroit Lions running back Zach Zenner (34) during a NFL football game against the Green Bay Packers on Sunday, Dec. 30, 2018 in Green Bay, Wisc. (Detroit Lions via AP).

Detroit Lions running back Zach Zenner (34) during a NFL football game against the Green Bay Packers on Sunday, Dec. 30, 2018 in Green Bay, Wisc. (Detroit Lions via AP).

Detroit Lions running back Zach Zenner (34) during voluntary offseason workouts at the Detroit Lions training facility on Tuesday, May 8, 2018 in Allen Park, Mich. (Detroit Lions via AP)

Detroit Lions running back Zach Zenner (34) takes the handoff from Detroit Lions quarterback Matthew Stafford (9) during a NFL football game against the Minnesota Vikings on Sunday, Dec. 23, 2018 in Detroit. (Detroit Lions via AP).

Detroit Lions running back Zach Zenner (34) serves food at the annual Thanksgiving Dinner at Ford Field with families from Orchards, Children's Center and Yatooma as part of the Season of Sharing campaign presented by Meijer.

Detroit Lions quarterback Matthew Stafford (9) hands off to Detroit Lions running back Zach Zenner (34) before a NFL football game against the Green Bay Packers on Sunday, Dec. 30, 2018 in Green Bay, Wisc. (Detroit Lions via AP).

Detroit Lions running back Zach Zenner (34) before a NFL football game against the Minnesota Vikings on Sunday, Dec. 23, 2018 in Detroit. (Detroit Lions via AP).

Detroit Lions running back Zach Zenner signs autographs for fans following training camp practice on Thursday, Aug. 2, 2018 in Allen Park, Mich. (Detroit Lions via AP)

Detroit Lions running back Zach Zenner (34) during a NFL football game against the Arizona Cardinals on Sunday, Dec. 9, 2018 in Glendale, Ariz. (Detroit Lions via AP).

Detroit Lions running back Zach Zenner (34) during a NFL football game against the Arizona Cardinals on Sunday, Dec. 9, 2018 in Glendale, Ariz. (Detroit Lions via AP).

Detroit Lions running back Zach Zenner (34) during a NFL football game against the Minnesota Vikings on Sunday, Dec. 23, 2018 in Detroit. (Detroit Lions via AP).

Detroit Lions running back Zach Zenner (34) celebrates a touchdown run during a NFL football game against the Arizona Cardinals on Sunday, Dec. 9, 2018 in Glendale, Ariz. (Detroit Lions via AP).

Detroit Lions running back Zach Zenner (34) recovers an onside kick during a NFL football game against the Carolina Panthers on Sunday, Nov. 18, 2018 in Detroit. (Detroit Lions via AP).

Detroit Lions running back Zach Zenner (34) during practice at the Detroit Lions training facility on Friday, Nov. 30, 2018 in Allen Park, Mich. (Detroit Lions via AP)

Detroit Lions running back Zach Zenner (34) during practice at the Detroit Lions training facility on Thursday, Nov. 15, 2018 in Allen Park, Mich. (Detroit Lions via AP)