Ezekiel Elliott will be inactive for Sunday’s Dallas Cowboys game due to disciplinary reasons, according to ESPN’s Todd Archer.

What exactly Elliott did to warrant a benching has not be revealed.

Elliott did not travel to Atlanta for the Cowboys’ Week 9 game against the Falcons. Running back Dalvin Cook, who began the season on the team’s practice squad before being elevated last week, will be with the main roster for the second week in a row. Cook will share the backfield with Rico Dowdle, who missed last week’s game due to illness.

In seven games this season, the 29-year-old Elliott has 149 rushing yards and two touchdowns. His absence for this week’s game marks the first time he will be a healthy scratch in a non-season finale situation in his nine-season NFL career.

The Cowboys currently rank last in the NFL in total rushing yards (519) and tied for last in rushing touchdowns (3).