Andie Hagemann of NFL.com reports.
The Chargers have yet to determine a timetable for Henry's return but he could miss at least a month, according to Ian Rapoport of NFL Network.
Henry, a former second-round pick, suffered a lacerated kidney late in 2017 and missed last season with a torn ACL.
When the 24-year-old went down in 2018, the Chargers re-signed franchise legend Antonio Gates to a one-year deal. The future Hall of Famer, who had 333 yards and two touchdowns last season, remains a free agent.
Henry's newest ailment likely explains why Los Angeles worked out former Oakland Raiders tight end Luke Willson on Tuesday, according to NFL insider Adam Caplan.
Okung will miss at least the first six weeks of the regular season after suffering a pulmonary embolism, while Gordon is holding out as he seeks a trade away from Los Angeles.