Dallas Cowboys left tackle Tyron Smith is probably not going to return before December after his left hamstring tore 

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 and fell off the bone during Wednesday's training, sources told ESPN on Thursday.

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 Smith is booked to have a medical procedure on Friday, a source told ESPN.

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 "It's a major dissatisfaction, none more so than for Tyron himself," Cowboys proprietor Jerry Jones said Thursday. 

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 Quickly that rallying call is 'we should make it happen right off the bat in the season,

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 since when Tyron gets back, we'll be that a lot more grounded.

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 "We need it pushed up there where we're in the number one spot. At the point when we arrive solid,

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 we can make that spat the end of the season games. This doesn't lessen that expectation"

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 Smith was harmed on a running play and went to the ground as he went to make a block on linebacker Leighton Vander Esch

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 He had the option to stroll to the storage space with practically no assistance, and the underlying tests demonstrated the ACL in his left knee was in one piece