Pittsburgh Steelers right tackle Marcus Gilbert was suspended without pay for violating the NFL's policy on performance-enhancing substances.
"We are disappointed that Marcus Gilbert has been suspended without four games for using performance-enhancing substances. He will not appeal the NFL's decision," Steelers general manager Kevin Colbert said in a statement.
Colbert also said Gilbert will not be allowed to be in any of the team's facilities until Dec. 18.
Gilbert has started 80 games since the Steelers drafted him in the second round of the 2011 NFL Draft. According to Pro Football Focus, he is the NFL's 11th-ranked tackle.
The 6-foot-6 Gilbert is the third Steeler to get suspended in the last three years. Wide receiver Martavis Bryant was suspended for all of 2016 for repeated drug violations and running Le'Veon Bell served a three-game ban for DUI and marijuana possession charges.