Watts was waived by the Rams on Friday, Joe Curley of the Ventura County Star reports.
Watts hasn't taken the field since serving a year-long suspension in 2015 for his second violation of the league's substance abuse policy. Although he's now free to sign with any team on the open market, he likely won't find many willing suitors.
Watts was signed by the Rams on Friday, ESPN's Nick Wagoner reports.
Watts was promoted from the practice squad, suggesting that Tre Mason (ankle) is unlikely to play. Even if he's active, Watts won't necessarily get any touches.
Rams running back Trey Watts has been suspended for the first four games of the 2015 season for violating the league's substance-abuse policy, according to profootballtalk.com.
Watts, who made the team in 2014 as an undrafted free agent, played in 14 games last season and rushed for 30 yards on seven carries.
Watts is eligible to return for Week 5 against the Packers.
The Rams have listed S Maurice Alexander, RB Trey Watts, CB Marcus Roberson, LB Daren Bates, OL Brandon Washington, TE Alex Bayer and DL Ethan Westbrooks as inactive Week 10 against the Cardinals.
Bates came into the ruled doubtful due to a groin injury. Roberson was considered questionable with an ankle injury. The other five players listed are healthy scratches.
Rams coach Jeff Fisher said the team's running back situation will continue to be a "week-to-week thing," adding Zac Stacy's lack of playing time Sunday wasn't an indicator of things to come. Stacy played one snap and got zero carries in the win over the Seahawks.
"We’ve got three outstanding runners," Fisher said, referring to Stacy, Benny Cunningham and rookie Tre Mason. "And as I mentioned, we think Trey Watts can also help us, so we’re going to use them all. It’ll be a week-to-week thing. Zac could get 25 carries this week. We had some things in early this week. It was working so we decided to stay with ‘Mase.' It’s nothing that Zac has done or hasn’t done. He’s been a little banged up the last couple of weeks, but obviously he’s an outstanding runner as well. We clearly have significant depth there at the position."
Fisher noted Stacy missed practice time the past couple weeks due to calf and ankle injuries.
"The good thing about this is he’ll come back and should be 100 percent this week and just see where it goes," Fisher said.
The Rams visit the Chiefs in Week 8.
The Rams ruled the following players inactive for Week 2 against the Buccaneers: Lamarcus Joyner, Trumaine Johnson, Tre Mason, Trey Watts, Barrett Jones, Matt Conrath, and Alex Bayer.
Rams rookie running back Tre Mason has a long way to go to earn meaningful snaps. The team's first depth chart lists him on the fourth team, behind starter Zac Stacy, backup Benny Cunningham and third-stringers Isaiah Pead and Chase Reynolds.
A third-round draft pick, Mason shares the fourth line of the depth chart with undrafted back Trey Watts.