Wide Receiver Darrius Heyward-Bey has missed four recent practices with what the Raiders are calling "fatigue," according to Jerry McDonald of the Contra Costa Times. The Raiders are selling it as a case of over-training, and they're saying that they don't want to risk injuring the second-year receiver. "He is fatigued. We wrap him up, we keep him out of things,'' coach Tom Cable said. "When it gets to the point where if we push it anymore he might get injured, I'm not going to do that. I backed off.'' Source: Rototimes