Terrell Owens' first game action with the Dallas Cowboys will have to wait yet another week — at least.

The star wide receiver, who has yet to play in the preseason, said he reaggravated his left hamstring injury by returning to practice too soon last week.

"At this point, yeah, I will be close to 100 percent before I get back on the field," Owens said Wednesday. "I'm not going to jeopardize my health just because of speculation or anything like that."

Like he did for most practices during training camp in Oxnard, Calif., Owens rode a stationary bicycle when the Cowboys held their first workout at home.

Owens characterized his injury as a "severe pull" and said he almost certainly will miss his third straight preseason game. The Cowboys play at home Saturday night against San Francisco, Owens' original team.

"It's frustrating, but it's not where I need it to be to play and perform like I need to," Owens said. "So at this point, I'm going to be smart about it."

Asked if he could play if the regular season were starting, Owens said, "I doubt it, not the way I need to play."

After missing 14 consecutive training camp practices and the preseason opener in Seattle because of the hamstring problem that has bothered him all month, Owens returned for five practices last week. He then missed the final full workout in California and didn't play Monday night against New Orleans in Shreveport, La., after the hamstring tightened up on him.

Owens had returned to practice after Cowboys owner Jerry Jones suggested that the receiver needed to learn how to practice at less than 100 percent. His first practice back came only hours after coach Bill Parcells reiterated that Owens needed to be on the field.

Titans

Vince Young gave the Titans — and himself — a scare when the back of his throwing hand slammed against a helmet during practice.

Young was examined on the field, then walked off for X-rays and did not return to practice. Coach Jeff Fisher said he wasn't too concerned, because the preliminary examination on the field indicated only a bruise.

"He's going to be all right. X-rays were negative," Fisher said. "He's going to have a sore hand, and we haven't ruled him out for the game."

Bears

Running back Thomas Jones will start Friday against the Arizona Cardinals after missing the first two preseason games with a pulled hamstring.

"He feels good," coach Lovie Smith said after Wednesday's practice. "He doesn't think he'll be (limited). We don't think he'll be, but we know he's coming off an injury and will keep that under consideration. But we think he should be fine and ready to go."

Lions

Wide receiver Charles Rogers will miss Friday's preseason game at Oakland because of a knee injury, which forced him to miss the previous game and two weeks of practice.

Colts

Backup running back James Mungro will miss the entire season after tearing a knee ligament during Sunday's preseason game against Seattle.

Patriots

Veteran Martin Gramatica was released, giving the place-kicking job to rookie Stephen Gostkowski.

Gramatica, 30, didn't play last season.