Tyron Smith endures separation break of knee

The Dallas Cowboys will be without Pro Bowl passed on tackle Tyron Smith for a huge stretch to open the season.

Smith experienced a separation break of the knee in Wednesday's training and needs a medical procedure, NFL Network Insider Ian Rapoport detailed Thursday.

Smith won't be back on the field until December, if at this season.

Rapoport later detailed that Smith is set to go through a medical procedure on Friday.

The 31-year-old went down by and by with a non-contact injury however had the option to stroll off under his own power.

Ranchers proprietor Jerry Jones said during a Thursday appearance on ESPN's First Take that he anticipates that Smith should be back

"We'll have him and we'll have him with impeccable timing," Jones said. "We'll have him in that San Francisco game

what might be compared to that we had last year - - and perhaps we won't miss the mark."

While the Cowboys have become acclimated to playing without the eight-time Pro Bowler, who has missed 20 games the beyond two seasons and hasn't played

a whole season beginning around 2015, it's a huge catastrophe for Dak Prescott's blindside.