The Eagles' biggest rival has suffered heavy losses on their offensive line.

According to a report in ESPN, the Dallas Cowboys skipped

Tyrone Smith's hamstring tour in Wednesday's practice.

ESPN reports that Smith could have surgery as early as Thursday,

and is unlikely to return before December.

Smith was hurt as he went to block linebacker Leighton Vander Esq on a running play.

ESPN reported that he was able to walk to the locker room without help,

and initial tests showed that Smith had an intact ACL in his left knee.

Smith's absence would be a major loss for the Cowboys

and would have a major impact on the race to win the NFC East.