Cooper (knee) is active for Sunday's game against the 49ers.

With Eric Berry unavailable, Cooper's presence is even more valuable for the Chiefs' pass defense.

Cooper (knee) is officially listed as questionable for Sunday's game against the 49ers, Adam Teicher of ESPN reports.

Cooper was added to the injury report Thursday and was a limited participant in practice due to a knee injury. With Eric Berry already ruled out for Sunday's game and Ron Parker moving over from safety to take his place, Cooper's absence would be a big blow to the secondary.

Cooper is inactive for Sunday's game against the Titans, according to Adam Teicher of ESPN.com.

Cooper suffered an ankle injury in practice Wednesday and he was unable to practice at all Thursday due to the ailment. Ron Parker will take his spot in the starting lineup.

Cooper suffered an ankle injury in practice Wednesday that could hold him out Week 1 against the Titans, the Kansas City Star reports.

Cooper didn't practice Thursday following the injury after suffering from some swelling in the ankle. If he is unable to go for Week 1, Ron Parker would take his spot at left cornerback in what is an already thin secondary compared to last season.

Cooper (hamstring) returned to practice Friday, the Kansas City Star reports.

Cooper, who suffered a slight hamstring pull on Thursday, was able to return the field quickly, a bit of welcome good news for the Chiefs' secondary, which will now be without Sanders Commings indefinitely.

Cooper strained a hamstring in practice Thursday, ESPN.com reports.

With Cooper hobbled, Sean Smith moved in to work with the starters, as Thursday's session progressed.

Chiefs CB Marcus Cooper has been working with the first-team defense at OTAs.

Cooper started at left cornerback in nickel packages last season, but will take on an expanded role following the release of Brandon Flowers. Third-round CB Phillip Gaines is also in the mix for snaps on the outside. Cooper's play declined late in 2013 and he graded out negatively both against the run and in coverage. At 6'1/192, he's a better fit than Flowers in Kansas City's press-man scheme and could make a sophomore year leap.

The Chiefs benched rookie LCB Marcus Cooper for Week 16 against the Colts.

Following a very impressive start to his seventh-round rookie year, Cooper had struggled mightily of late, likely losing confidence. The Chiefs went with Dunta Robinson at slot/nickel back, and Brandon Flowers kicking over to left corner. Coach Andy Reid said Monday the Chiefs will still give Cooper an opportunity to "work his way back in," likely by playing in Week 17.

Chiefs claimed CB Marcus Cooper off waivers from the 49ers.

Cooper was San Francisco's seventh-round pick this past April. He'll slot in as depth behind Brandon Flowers, Dunta Robinson, and Sean Smith at corner.

49ers agreed to terms with No. 252 overall pick CB Marcus Cooper on a four-year contract.

The third to last pick of the draft, Cooper is facing long odds of cracking the 49ers' 53-man roster. He should be stashed on the practice squad where he'll be developed as a potential special teamer.