The Cowboys and defensive end Sean Lissemore agreed to a three-year extention on Thursday.
Lissemore is in his thid year out of William and Mary. Lissemore was a seventh-round pick in 2010 and is now under contract until 2016. He recorded two tackles in the Cowboys season-opening win.
The Cowboys will visit Seattle on Sunday afternoon. Kickoff is set for 3:05 CST.