Quarterback Brodie Croyle missed Kansas City's practice Wednesday with a sore back, and his availability for this week's game against San Diego could be in question. Croyle, making his second start, was kicked in the back early in the Chiefs' 20-17 loss to Oakland on Sunday. He played the rest of the game but has been too sore to do much all week. "He's sore, pretty sore," said Chiefs' Coach Herm Edwards. "We'll see tomorrow where he's at, if can go. Tomorrow we'll find out. We'll wait as long as we can." A second-year pro who had a history of injuries during his college career at Alabama, Croyle was first thought not to be seriously hurt. But by Monday, Edwards said it still looked bad.