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

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 Smith experienced a separation crack of the knee in Wednesday's training and needs a medical procedure

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 NFL Network Insider Ian Rapoport detailed Thursday. Smith won't be back on the field until December, if at this season.

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 The 31-year-old went down practically speaking with a non-contact injury yet had the option to stroll off under his own power.

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 Cowpokes proprietor Jerry Jones said during a Thursday appearance on ESPN's First Take that he doesn't know whether Smith will require a medical procedure, however,

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 Jones showed that he anticipates that Smith should be once again eventually this season - - possibly at the end of the season games.

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 "We'll have him and we'll have him with flawless timing," Jones said

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 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."

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