Caldwell (hamstring) was ruled out of Sunday's game against the Steelers.
Caldwell hurt his hamstring last Sunday against the Steelers and wasn't able to practice in any capacity this week.
Caldwell appears to have suffered the hamstring injury during Saturday's win over the Chargers, and it may keep him out in Week 17. He has spent just one game on the Browns' active roster this season.
Caldwell was promoted to the Browns' active roster Wednesday, CBS's Daryl Ruiter reports.
Caldwell, the Browns' fifth-round pick, injured his hamstring during training camp and spent the entire season on the practice squad. To make room on the active roster, Cleveland released fellow defensive back Trae Elston.
Caldwell suffered a hamstring injury during the onset of training camp, Nate Ulrich of the Akron Beacon Journal reports.
It's currently unclear whether the hamstring was merely tweaked or if Caldwell has suffered something worse. Either way, there has been no timeline provided for his return. When healthy, the Browns' fifth-round pick will compete for a role out of the slot.