Rapoport added that Delmas was scheduled to undergo an MRI on Wednesday to confirm the initial diagnosis.
Per the Charlotte Observer, it was a non-contact injury on the same knee in which he tore his ACL against the Baltimore Ravens late last season. The issue forced him to injured reserve.
Delmas was slated to hold down the back end of Miami's secondary along with strong safety Reshad Jones.
After a solid 2014 that included 49 tackles, a pair of fumble recoveries and a pick returned 81 yards for a touchdown, the Dolphins were hoping the lingering knee issue wouldn't creep up again.
Here's the rest of Wednesday's injury news:
- The Panthers suffered a devastating blow when it was discovered that star receiver Kelvin Benjaminsustained a torn left ACL on Wednesday, according to Rapoport. It wasn't a good day in general for Carolina receivers as rookie wideout Devin Funchess tweaked his hamstring and could miss a few days, according to Ron Rivera.