Oliver (hamstring) worked out Monday on a side field, Phillip Heilman of The Athletic reports.

EDGE Analysis

Oliver hasn't practiced since injuring his hamstring Aug. 1. Coach Doug Marrone hopes to have the rookie ready for Week 1, but all the missed time this summer will make it difficult for Oliver to open the season with a key role. The Jaguars list both Geoff Swaim and James O'Shaughnessy as starters on their preseason depth chart, with Oliver and Ben Koyack falling in behind.

Oliver suffered a "significant" hamstring injury at practice Thursday, Michael DiRocco of ESPN.com reports.

EDGE Analysis

Coach Doug Marrone was unable to offer a recovery timetable for Oliver, but the coach classifying the injury as "significant" indicates Oliver could be facing a multi-week absence, at least. The rookie third-round pick entered training camp looking to supplant free-agent acquisition Geoff Swaim from the starting role, but that will be a difficult proposition if he ends up sidelined for a chunk of the preseason.