Dallas signed defensive back Tra Battle off San Diego’s practice squad Wednesday, and he could play Thursday for the Cowboys.

The Cowboys created a roster spot for Battle when they placed put rookie running back Felix Jones on injured reserve.

Coach Wade Phillips said Battle, who played only one game for the Chargers after signing as an undrafted free agent last year, could play on special teams against Seattle.

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Indianapolis Colts safety Bob Sanders will miss Sunday night’s game in San Diego because of his ailing right knee.

The NFL defensive player of the year last season missed last week’s game because of swelling in the knee and was listed as questionable earlier this week.

The Colts said Saturday night he did not make the trip to San Diego.

Colts coach Tony Dungy said Friday there’s a good chance cornerback Kelvin Hayden will return to the starting lineup for Sunday night’s game at San Diego.

The status of safety Bob Sanders, however, probably won’t be determined until just before gametime, Dungy said.

Sanders, the NFL Defensive Player of the Year last season, has had swelling in his right knee the past two weeks and was inactive for last week’s 33-27 win over Houston.

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Oft-injured wide receiver Craig Davis, a disappointment in his two seasons with the San Diego Chargers, will miss the rest of the season with a groin injury.

Davis was placed on injured reserve on Wednesday. Tackle Corey Clark was signed from the practice squad to take Davis’ spot on the active roster.

Davis had only four catches for 59 yards and no touchdowns this season and missed the last five games while recovering from the injury.