Rams' Zac Stacy probable vs. 49ers

EARTH CITY, Mo. -- Barring a setback in the next 48 hours, the St. Louis Rams will have running back Zac Stacy available Sunday against the San Francisco 49ers.

Stacy suffered a concussion last week against Chicago and began the week needing to clear all of the steps of the concussion protocol before he could return to work.

After sitting out Wednesday's practice and participating on a limited basis Thursday, Stacy returned to practice on a full-time basis Friday and is officially listed as probable on the injury report.

Stacy passed the final hurdle Friday afternoon and has been cleared to return to action against the Niners.

Two other Rams, cornerback Trumaine Johnson and guard Chris Williams, also were cleared from concussions suffered last week and are also listed as probable for Sunday.