The NFL suspended Chargers linebacker Stephen Cooper for the first four games of the regular season without pay Tuesday for violating the league’s policy on steroids and related substances. Cooper will begin his suspension on August 30th and will be eligible to return on September 29th. He will, however, be able to play in all preseason games. Cooper said in a statement that he has accepted the ban for his use of a stimulant that was recently added to the NFL’s list of prohibited substances and that the stimulant was not used before any game or with the intent to enhance performance. The 28-year-old recorded 16 tackles, one sack and one interception while playing in all 16 games with the Bolts last season. Cooper hasn’t missed a single game over his five-year career with San Diego, and has racked up 258 tackles, seven sacks and three picks over 80 contests.