FRISCO, Texas -- When the Dallas Cowboys take on the New York Jets on Sunday, they will be down three starting offensive linemen with left tackle Tyler Guyton ruled out because of a concussion.

It is possible they could be down a fourth with Pro Bowl left guard Tyler Smith (knee) listed as questionable after he did not practice this week. In addition to Guyton, center Cooper Beebe will miss his third straight game with a broken bone in his foot, while right guard Tyler Booker will miss his second straight game with a high right ankle sprain.

Guyton remains in the concussion protocol. Smith had an MRI earlier in the week on his knee.

Head coach Brian Schottenheimer said he does not have a hard and fast, "no practice, no play rule."

"I do think it's harder for young players w

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