Cowboys rookie WR Terrance Williams undergoes concussion test

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Cowboys rookie wide receiver Terrance Williams was shaken up during Friday’s practice and underwent a concussion evaluation, Calvin Watkins of ESPNDallas.com reported.

DallasCowboys.com suggested that Williams could potentially miss the club’s first two preseason games: Sunday’s meeting with Miami in Canton, Ohio and Friday’s contest at Oakland.

A third-round pick from Baylor, Williams is listed as second-string behind Miles Austin on the Cowboys’ depth chart. Williams is one of the top candidates to be the club’s third receiver — an important role in Dallas’ pass-happy offense, considering the attention defenses must pay to wideout Dez Bryant, tight end Jason Witten and Austin.