Pittsburgh Steelers running back Le’Veon Bell is facing a four-game suspension for violating the NFL’s substance abuse policy, according to multiple reports.

The suspension reportedly stems from a missed drug test. Bell is reportedly appealing the suspension.

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ESPN’s Dan Graziano first reported the suspension.

Bell was suspended for the first three games of the 2015 season for violating the league’s substance abuse policy following an arrest for DUI and marijuana possession. That suspension was reduced to two games upon appeal.

Bell, a second-round pick out of Michigan State in 2013, returned from that suspension and rushed for 556 yards and three touchdowns in six games before suffering a torn MCL and PCL on Nov. 1 against the Bengals.

Bell had a breakout season in 2014, totaling 2,215 yards from scrimmage (1,361 rushing, 854 receiving) and 11 touchdowns.

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DeAngelo Williams would see the bulk of the Steelers’ rushing attempts should Bell miss any time. Williams, who signed with the Steelers last season, rushed for 907 yards and 11 touchdowns in 16 games last season, with 872 of those yards coming in the 10 1/2 games that Bell missed.