Greenlaw (Achilles) was a limited participant at the 49ers' practice Tuesday, Matt Maiocco of NBC Sports Bay Area reports.
Greenlaw is dealing with some Achilles discomfort to open the week at practice, but his ability to participate in any capacity Tuesday seems to suggest it is likely a minor issue. The veteran's participation at practice Wednesday will provide more clarity toward his status for Thursday night's regular-season opener against Los Angeles.