It has been a rough start to the season for Robert Gallery. The starting left tackle of the Raiders suffered a partially torn calf muscle in practice on Wednesday and will be sidelined two to three weeks. Gallery, 26, made the transition from right tackle to left tackle during training camp, but struggled in the Raiders' 27-0 loss against San Diego last Sunday. Oakland yielded nine sacks and Gallery often was victimized by outside linebacker Shawne Merriman, who recorded three sacks.