Webb (knee) didn't practice Wednesday, Jeff Miller of the Los Angeles Times reports.
Coach Brandon Staley indicated he is day-to-day. Either way, it's a discouraging sign for Webb, who saw just six defensive snaps in his rookie season last year. Once he returns from his knee issue, his best chance at a spot on the Chargers' 53-man roster is likely as a special teams contributor after Los Angeles added JT Woods at safety in the third round of this year's draft.