Cowboys linebacker Sean Lee (concussion) will not return to Sunday's game in New Orleans, NFL Network's Desmond Purnell reports.

Lee left during the first half to be evaluated for a concussion, and he was ruled out for the night shortly thereafter. Even with Rolando McClain (knee/suspension) potentially returning next week, it will be a big blow to the Dallas defense if Lee misses time any games beyond Sunday. Lee was also off to a fantastic IDP start, with 33 tackles (23 solo), a sack and an interception through three games. He also had three more tackles (two solo) before leaving Sunday's game.

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