Vaughn missed Wednesday's practice for personal reasons, Rick Stroud of the Tampa Bay Times reports.
Head coach Todd Bowles sounded less than thrilled about the situation and said Wednesday that he wasn't sure if Vaughn would be available for Sunday's game against the Vikings. The fourth-year pro is listed as the No. 4 back on Tampa Bay's initial depth chart for the regular season, behind Rachaad White, Sean Tucker and Chase Edmonds.