Renfrow was limited at practice Wednesday due to an ankle injury, Paul Gutierrez of ESPN.com reports.
Renfrow is tending the ankle issue after he played 45 of a possible 69 snaps in last Sunday's loss to the Giants, finishing the day with seven catches on nine targets for 49 yards and a touchdown. So far there's nothing to suggest that the Raiders' slot man is in danger of missing this weekend's game against Kansas City, but he'll presumably need to log a full practice by Friday in order to avoid an injury designation.