HENDERSON, Nev. (AP) — Raiders left tackle Kolton Miller is heading to injured reserve because of a high ankle sprain, a person with knowledge of the injury told The Associated Press on Tuesday, dealing Las Vegas the loss of its best offensive lineman. The person spoke to the AP on condition of anonymity because the Raiders have not made an announcement regarding a medical update. Miller was injured with 43 seconds left in the Raiders’ 25-24 loss to Chicago on Sunday. Miller has been easily the Raiders’ best lineman. Las Vegas also could go with rookie Charles Grant when the Raiders visit Indianapolis on Sunday.