St. Louis Rams linebacker Jo-Lonn Dunbar was suspended for four games without pay by the NFL for violating the league's policy on performance-enhancing substances, the league announced Wednesday.
After sitting out the first four games of the regular season, Dunbar will be eligible to return to the active roster after the Rams' game against the San Francisco 49ers on Sept. 26.
In the meantime, Dunbar is permitted to practice and play in preseason games.
Dunbar, projected as a starting outside linebacker this season, is considered a strong run-stopper. He finished the 2012 season with 115 tackles, 4.5 sacks and two forced fumbles.
Will Witherspoon, recently signed by the Rams, is expected to move into Dunbar's starting spot until he returns.