Rick Hummel is a Cardinals beat writer for the St. Louis Post-Dispatch.
He'll be in lineup, with Knizner as backup, until Molina returns.
KK will make his first big-league start Monday here against the Pittsburgh Pirates.
Cardinals, MLB have had to adapt before due to other major interruptions.
It looks as if the third-base job is becoming his.
Pittsburgh pitching shuts down Cards' offense, with bullpen striking out eight of the 14 St. Louis hitters it faced from the sixth through the ninth.