St. Louis Rams running back Zac Stacy left his team's Week 12 game against the Chicago Bears with an apparent head injury. Jim Thomas of the St. Louis-Post Dispatch tweeted the news.
The Chicago Tribune's Brad Biggs reported it was a possible concussion, and ESPN's Jeff Dickerson confirmed Stacy would be out for the game:
Benny Cunningham entered the game as Stacy's replacement.
Stacy had been having a great game, tallying 87 rushing yards and a touchdown on just 12 carries. He had really been turning it on in recent weeks, and was beginning to earn must-start consideration. With at least 127 rush yards in two of the last three games with three touchdowns, Stacy had been climbing the running back ranks.
Cunningham had just 27 attempts for 129 yards entering play on Sunday, though he racked up 109 yards on 13 carries with a touchdown against the Bears in Stacy's absence.
Should Stacy miss a significant amount of time, expect Cunningham to be the featured back, though he could lose snaps to Daryl Richardson, who was a healthy scratch for Week 12. Cunningham will have value for fantasy owners, but don't expect him to put up the same numbers that Stacy had been.
With tempered expectations, owners should look to pick up Cunningham with plans to play him as a flex option—but nothing more just yet.