Janis was absent from Saturday's practice due to a knee injury, Scott Petrak of the Elyria Chronicle-Telegram reports.
Janis spent most of last season serving as a special teams player in Green Bay and will take aim at a similar role for the Browns this season. His attempt at earning a 53-man spot will temporarily be put on hold by the knee injury, and there's no indication at this point how long he's expected to remain sidelined.