McBean, the former Denver Bronco who agreed to terms on a one-year deal with the Ravens yesterday, had his six-game suspension for violating the league's performance-enhancement policy reduced to three games.
In exchange for the reduced suspension, McBean has dropped his lawsuit against the NFL that alleged the league improperly handled his drug test.
McBean, 28, spent the previous three seasons with the Broncos and had his best year in 2011 with 33 total tackles and four sacks while playing in all 16 regular-season games.
McBean, who is 6-5 and 305 pounds, is the second veteran defensive lineman to sign with the Ravens within the past week. They also brought back defensive tackle Maake Kemoeatu last week.
In his career, McBean has 77 tackles and four sacks in 46 games. He started 21 games for Denver over the last three seasons.
With the reduced suspension, McBean will now be eligible to play in the Ravens' Week Four game against the Cleveland Browns.