Altuve left Saturday's game with an illness, Alyson Footer of MLB.com reports.
Tony Kemp pinch hit for Altuve in the eighth inning, and manager A.J. Hinch revealed afterward that Altuve got sick before and during the game. Altuve's status for Sunday won't be known until the Astros' lineup is released a few hours before first pitch, but the hope is that it's just a 24-hour bug.