OXNARD, Calif. — Jason Witten has a spleen injury and the Pro Bowl tight end for the Cowboys will likely miss the rest of the preseason.

It is unclear if Witten will be ready for the Cowboys’ regular season opener Sept. 5 against the Giants.

Cowboys coach Jason Garrett said yesterday Witten sustained a “slightly lacerated” spleen in the preseason opener Monday night. He said Witten has to remain still as much as possible over the next week so he can heal.

“It’s a very serious injury and we’re really taking this thing day by day,” Garrett said.