Coach Sean McVay said after Tuesday's joint practice with the Cowboys that Garrett didn't take part due to swelling in his knee, Lindsey Thiry of ESPN.com reports.
Garrett missed some time early in training camp due to what McVay called "soreness in his lower half," per Sarah Barshop of ESPN.com, and the location of the injury is now known. McVay added Tuesday that Garrett is "85 percent." Garrett still has a month to get back to full health before the Rams' Week 1 matchup with the 49ers in Melbourne, Australia.