The rookie tight end emerged as a bright spot in an otherwise lost season before suffering a concussion last month. Reed nearly returned on two occassions, but he now exists in a state of limbo as symptoms of the head injury linger.
"We're going to do what we can to make sure that he's looked at carefully, and when the doctors say that he's ready to go, he'll be ready to go," Shanahan said, via ESPN.com.
UPDATE: Shanahan announced at a news conference that Reed will be placed on injured reserve and miss the remainder of the season. A specialist recommended that Reed not practice for the next three weeks.