Denver Post Reporting:
Dawkins and Lloyd have injuries, but there is no indication why Marshall didn't make the trip. One would assume it is not injury, as he was healthy enough to practice all week on the scout teamSEATTLE — Brandon Marshall's return from offseason hip surgery will have to wait at least another week.
Marshall, the Broncos' top receiver who, besides health issues, has asked to be traded, did not make the trip here for the Broncos' preseason game Saturday night against the Seattle Seahawks.
Also not making the trip were safety Brian Dawkins, who has a broken hand, and backup receiver Brandon Lloyd, who has an unspecified injury.
http://www.denverpost.com/broncos/ci_13181244