Realmuto is out of the lineup Saturday against the Cardinals, Andre Fernandez of the Miami Herald reports.
Jeff Mathis will step in behind the plate to catch for starter Colin Rea as Realmuto sits following three straight starts. Realmuto is now batting .325/.371/.398 for the month of July, his third straight month hitting over .300. He's been a top-five catcher so far in traditional fantasy leagues.