IRVING, Texas – Jason Witten is done doing nothing.

Witten, who was required to be idle for a week and a half after suffering a lacerated spleen in the preseason opener, did rehab drills with resistance cords at the beginning of Monday’s practice.

The seven-time Pro Bowl tight end’s status for the Sept. 5 season opener against the New York Giants is still uncertain. The Cowboys will know more about Witten’s condition after he visits a doctor Tuesday.

Other injury updates:

*Center Phil Costa returned to practice for the first time since straining his lower back Aug. 10. Owner/general manager Jerry Jones said he expects Costa to play in Wednesday’s preseason finale, but coach Jason Garrett said that decision has yet to be made.

*Receiver Dez Bryant joined Witten in working on the resistance cords with associate athletic trainer Britt Brown. Bryant has been sidelined the last week by knee tendinitis, but there is no concern about his availability for the season opener.

*The Cowboys expect receiver Miles Austin and DeMarcus Ware to play in the season opener, but they are still not practicing because of strained hamstrings.

*Rookie defensive end Tyrone Crawford did not practice because he is sick.