Cowing (hamstring) returned to practice Tuesday, Nick Wagoner of ESPN.com reports.
Cowing's return to practice is timely, given that fellow rookie wide receiver Ricky Pearsall re-aggravated the shoulder injury Tuesday that forced him to start training camp on the active/NFI list. With trade rumors circulating around Brandon Aiyuk and injuries piling up for the 49ers, Cowing has an opportunity to earn more reps on offense and on special teams as a kick returner.