Whitcomb was optioned to Triple-A Sugar Land on Monday, Brian McTaggart of MLB.com reports.
The Astros needed to promote a catcher ahead of Monday's game against the Dodgers after Yainer Diaz (abdomen) was a late scratch, and Whitcomb will end up being the roster casualty. Whitcomb has struggled to a .077 average with one home run, three RBI and one run scored through 10 games this season.