Bears defensive tackle Ego Ferguson became the second Chicago player in three days to be suspended four games for violating the NFL's policy on performance-enhancing substances.
Ferguson's punishment was announced Thursday, two days after backup offensive tackle Tayo Fabuluje was suspended. Fabuluje said in a statement he was informed he tested positive for an amphetamine after taking a supplement that did not list any banned substances on the label.
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Ferguson was placed on injured reserve last month because of a knee injury. He appeared in four games with one start this season after playing in all 16 as a rookie in 2014. He will begin serving his suspension immediately.
The league also suspended practice squad receiver Jalen Saunders for an unspecified policy violation.
The Bears (3-5) visit St. Louis (4-4) this week.