Saffold was discharged Sunday night from a hospital after results of several medical tests were negative. He had a CT scan and X-rays.
Fisher declined to speculate on a time frame for Saffold's return, saying the player's status would be addressed on the injury report later in the week.
"We still have some further tests to do, but it appears at this point it's just a significant strain," Fisher said. "So he's very lucky. So that's good news on our behalf."
Fisher said the Rams would use the new "marquee" injured reserve rule that allows them to activate one player off IR for Week 9, and bring back Wells then. He said Wells' rehab period coincides pretty well with the IR timing.
Wells, who got a four-year, $24 million free agent deal from the Rams, has barely been on the field. He missed the first two preseason games coming off surgery on his right knee.
The 6-foot-5, 314-pound Saffold is in his third season with the Rams after getting drafted in the second round in 2010. He started nine games last season, but missed the last seven games with a pectoral injury.
Copyright 2012 by The Associated Press