OWINGS MILLS, Md. – Baltimore Ravens cornerback Asa Jackson was suspended without pay for the first eight games of the regular season for violating the NFL’s policy on performance-enhancing substances.

“My reaction to that is that you’ve got to follow the rules,” Coach John Harbaugh said after practice Friday. “If you don’t follow the rules, you get suspended. That’s a fair rule, there’s no place for that, and he’s getting what he deserves. We’ll be missing Asa those first eight weeks. Whether he’ll be back after that, time will tell.”

EAGLES: Philadelphia excused receiver Riley Cooper from all team activities as he deals with repercussions of being caught on video making a racial slur.

BROWNS: Running back Trent Richardson sat out practice after being kicked in the right shin a day earlier at training camp.

SEAHAWKS: Receiver Sidney Rice returned to Seattle after seeking treatment for a sore knee in Switzerland.

JETS: Mark Sanchez feels as though he’s having a “great camp” as he tries to hold off rookie Geno Smith for the starting quarterback job.

BILLS: Receiver Stevie Johnson left practice after injuring his left hamstring.

JAGUARS: Jacksonville was awarded rookie Luke Ingram off waivers from Pittsburgh, giving it three long-snappers on the roster.

Defensive end Jeremy Mincey was sidelined with a possible concussion.

TITANS: Middle linebacker Colin McCarthy will miss at least a week after hurting his right hamstring, and Coach Mike Munchak said McCarthy won’t play in the exhibition opener Thursday against Washington.

49ERS: Cornerback Chris Culliver will miss the season with a torn ACL in his left knee.

BENGALS: Cincinnati signed defensive tackle Vaughn Meatoga from Hawaii, giving him a chance to show he can fit into the line rotation.

CARDINALS: A knee injury that forced starting nose tackle Dan Williams off the practice field was deemed not serious and he expects to be sidelined only for a few days.

RAIDERS: Oakland signed kicker Sebastian Janikowski to a four-year extension, ensuring the franchise’s leading scorer will remain with the team through at least 2017.

MATT BIRK, who placed center for Baltimore last season before ending a 15-year career, will replace Art Shell as one of the two appeals officers approved by the NFL and the players’ union.

STEELERS: Cornerback Cortez Allen underwent minor surgery on his right knee but is expected to return before the beginning of the regular season.

BEARS: Chicago agreed to a three-year contract with linebacker Andrew Starks and waived kicker Austin Signor.