Castro is out of the lineup for Friday's contest versus the Cardinals.
It marks the third consecutive absence from the lineup for Castro, who had started 11 straight and 22 of 23 games prior to this three-game playing-time drought. Castro has an .828 second-half OPS, so this could simply be about the Rockies giving younger players a look. Adael Amador will play second base and Connor Norby will be at third base Friday.