Anthony Spencer returns to practice

IRVING, Texas -- Cowboys defensive end Anthony Spencer returned to practice Friday morning after missing Thursday's session. On Wednesday, Spencer was limited in practice; it was the first time he participated in practice since having left-knee surgery on July 25.

Cowboys officials said Spencer's day off on Thursday was planned, but it's still a concern that he's practiced just twice since training camp started.

"He hurt his knee early in training camp, and [we tried] to get him back as quickly as possible," coach Jason Garrett said of Spencer, who had 11 sacks in 2012. "He's worked very hard to get himself back, and we feel like this is a good plan for him. He's played a lot of football in his life. He's one of those veteran players who you would give a chance to come back, maybe earlier than maybe a younger player. But we'll just evaluate how he does today. We do think he had a good day on Wednesday. The plan was to rest him Thursday, and we'll see how he does in today's practice."

Quarterback Tony Romo (ribs), wide receiver Dez Bryant (foot), safety Danny McCray (hamstring), running back Lance Dunbar (foot) and Morris Claiborne (shoulder) participated Friday during the portion of practice open to the media.

Linebacker Ernie Sims (groin) missed practice and most likely won't play in Sunday's game against the Kansas City Chiefs.

If Spencer plays, the number of snaps he'll get against the Chiefs is unknown. The team will probably start George Selvie until Spencer is able to convince the coaches he can play a full game without any health issues.

There is also some concern regarding Claiborne. He separated his left shoulder in the fourth quarter of Sunday's victory against the New York Giants. Claiborne is expected to start but will play with a harness, which limits his mobility.

"It's getting looser and looser each and every day," Claiborne said Thursday of his shoulder. "I'm wearing the harness to get a feel for it, so it can help me."