Alvarez is not in the Astros' starting lineup against the Rays on Friday, Brian McTaggart of MLB.com reports.
Alvarez is already up to a career-high 637 plate appearances on the season and has gone 7-for-33 (.212) with one home run, two RBI and 10 strikeouts in September. He'll get a rest day for Friday's series opener, with Jose Altuve serving as the designated hitter and Nick Allen drawing the start at second base.