Castro was placed on the restricted list Wednesday so he can tend to a family matter, Maria Torres of The Athletic reports.
After Castro didn't appear in Tuesday's win over the Pirates, Nationals manager Dave Martinez said Wednesday the veteran infielder will be away from the team for an indefinite period of time while he deals with the personal matter. Luis Garcia was recalled from Triple-A Rochester in a corresponding move, and he could settle into a regular role at second base against right-handed pitching. In that scenario, Josh Harrison would cover Castro's usual spot at third base. Veteran utility man Jordy Mercer will also be in the mix for added playing time at either second or third base while Castro is away from the team.