St. Louis, MO (SportsNetwork.com) - St. Louis Rams running back Trey Watts will be suspended for the first four regular season games of the 2015 season for violating the NFL's substance-abuse policy.

Watts, an undrafted free agent from Tulsa, appeared in 14 games for the Rams in 2015 and carried the ball seven times for 30 yards and added three receptions.

The 24-year-old will be allowed to participate in offseason activities and the preseason.