The Cleveland Cavaliers have a growing level of worry about David Blatt's ability to reach the team, according to sources.

There is reportedly a rising concern in team circles about the level of response that Blatt is getting on the floor.

The Cavs would prefer not to be forced into evaluating their new coach just 30 games into Blatt's NBA career. But the Cavs' effort level, especially defensively, is eroding noticeably, raising the volume of questions about just how much the locker room is listening to the 55-year-old Boston native.