49ers' Jacob Cowing: Diagnosed with concussion

Cowing (concussion) has been ruled out for the rest of Sunday's game against Seattle, Nick Wagoner of ESPN.com reports.

Cowing entered concussion protocol after taking a hit to the head during a punt return in the second quarter. He won't return Sunday, and he'll have to clear the league's five-step protocol in order to play in Week 12 against the Packers on Nov. 24.