Jason Witten will be out for an undetermined period of time as he recovers from a lacerated spleen. (Gus Ruelas / AP)

Witten does not, as of now, require surgery for the injury he suffered on a blindside hit in Monday’s preseason game against the Oakland Raiders.

“It's a very serious injury, and we're really taking this thing day by day,” Cowboys coach Jason Garrett said. “He has to be very still and idle for the next week to 10 days, so you won't see him out here on the practice field; he won't play in the game this week or next week. We've just got to make sure he heals as well as possible, as quickly as possible.

“As you can imagine, spleens are internal organs, and there're serious injuries involved with those things. Asking Wit to be still and idle is a hard thing; that's the biggest challenge right now.”

Yes, spleens are internal organs and a laceration is a serious injury. Still, Garrett couldn’t keep Witten, who once played with a fractured jaw, off the practice field Wednesday. He carefully walked on and watched a walk-through. As he left, he said only, “I’ll be all right.”

It’s mid-August and the timing of the injury is important. Garrett was already tearing pages off the calendar, noting that the Cowboys have an 11-day gap between their Wednesday night NFL opener against the New York Giants and their Sept. 16 game against Seattle.

“Ultimately what factors into it more than anything else is his health,” Garrett said. “We're not going to rush anybody back before they're ready to go and we'll just make those evaluations with him and anybody on our team prior to that.”

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