The Astros recalled Meyers from Triple-A Sugar Land on Friday, Chandler Rome of The Athletic reports.
Ruiz is not in the lineup for Friday's game versus the Reds.
Vivas is not in the lineup for Friday's contest versus the Reds.
Alvarez is slated to start Saturday's game against the Reds at Nationals Park.
Early (elbow) will not be sent for an MRI after he felt some minor forearm tightness during a live batting practice session Tuesday, Spencer Nusbaum of The Athletic reports.
Pinckney went 1-for-2 with a solo home run in Thursday's 7-3 loss to the Phillies.
Perales is a pitcher the Nationals believe is nearly ready to make his big-league debut, Spencer Nusbaum of The Athletic reports.
Mikolas (3-9) took the loss Thursday against the Phillies, allowing six runs on 12 hits and a walk across five innings. He struck out one.
The Nationals paused Early's (elbow) throwing program Thursday after he felt forearm tightness during his latest live BP session, Danielle Allentuck of The Washington Post reports.
Lile is not in the lineup for Thursday's contest in Philadelphia.
