Crawford sustained the injury while tackling running back Ezekiel Elliott. (As pictured in the tweet below.)
NFL Network Insider Ian Rapoport reports the lateral ankle sprain could keep Crawford out until the end of the preseason. Had Crawford fractured his ankle, it would be another huge setback for an already depleted Dallas defense -- Damontre Moore, David Irving and Randy Gregory will miss time this season due to off-the-field issues.
Crawford tweeted this sentiment later Tuesday evening: