Moustakas was reinstated Monday before the Royals opened a four-game series in Texas. Moustakas was batting second in the starting lineup.
The Royals optioned infielder Orlando Calixte to Triple-A Omaha.
Moustakas left the team Friday to head home to Los Angeles, and missed all three games in the weekend series at Detroit.
In his first 28 games, Moustakas hit .327 with three home runs.