White was down for a while and walked off the field gingerly in the second quarter at Minnesota on Thursday after getting hurt on a 9-yard run. The Broncos said his return was doubtful.
White was signed to back up Knowshon Moreno and Correll Buckhalter after his sudden release by Seattle this spring. He must sit out the first four games of the regular season, his punishment for violating the league's substance-abuse policy.
(Copyright 2010 by The Associated Press. All Rights Reserved.)