ST. LOUIS (AP) — Running back Zac Stacy, one of three Rams players who left Sunday's 42-21 win over the Chicago Bears with concussion-like symptoms, has been cleared to play at San Francisco on Sunday.
Cornerback Trumaine Johnson and left guard Chris Williams also were sidelined with blows to the head, but will be available against the 49ers.
All three returned to practice in a limited role Thursday, then were full participants Friday at Rams Park.
None of the three Rams who left against Chicago made it back into the game. Williams left in the second quarter. Stacy and Johnson both were hurt in the third period.
All three have been cleared to play against San Francisco (7-4).
Stacy briefly saw action for St. Louis in its first game against San Francisco before he became the starter. To see playing time this week, he had to be medically cleared.
"I'm good to go," said Stacy, who rushed for 87 yards and a touchdown before leaving the Bears game. "I took the tests and they came out well. They take these precautions."
Stacy has been a big part in the resurgence of the Rams. He has scored five touchdowns in the last five games and rushed for 100 yards in back-to-back games against Carolina and Seattle. He is second among all rookies with 624 yards.
"I was disappointed to have to come out because I want to help my team," Stacy said. "I felt like I was fine. Absolutely, it was hard to come out of there, but you have to do what the doctors say."
The Rams (5-6) will be trying to get back to the .500 mark for the first time since Oct. 13, when they were 3-3 after beating Houston 38-13.
Rams coach Jeff Fisher said that each player took the baseline concussion test earlier in the week. They all underwent a final neuro-psychological testing. Once that test was passed, they were given clearance.
"We have protocol," Fisher said. "We have evaluations (on the) sideline, inside, and then the doctors make the determination. All three of them are doing well."