Dallas Cowboys guard Zack Martin left practice with an apparent neck or shoulder injury during 11-on-11 work against St. Louis at training camp.
Martin went to the ground after making contact with a Rams defender and stayed down for several minutes before walking off the field on his own Tuesday.
Cowboys executive vice-president Stephen Jones said he hoped the injury was no more than a so-called "stinger," but that it was too early to tell. He and Cowboys owner Jerry Jones were among those around Martin while he was checked by the medical staff.
A first-round pick out of Notre Dame last year, Martin was the first rookie All-Pro for the Cowboys since running back Calvin Hill in 1969.
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