Campusano is out of the lineup for Wednesday's game against the Brewers.
The Padres reinstated Morgan (knee) from the 15-day injured list and optioned him to Triple-A El Paso.
Tatis is out of the lineup for Wednesday's game against the Brewers.
Tatis went 1-for-3 with a solo home run, an additional run scored and a walk in an 11-2 win over Milwaukee on Tuesday.
Halvorsen (1-1) earned the win over Kansas City on Tuesday, issuing one walk over one scoreless and hitless inning.
Betts went 3-for-4 with a solo home run, a double, a second RBI and two total runs scored in Tuesday's 5-4 extra-inning win over the Royals.
Snell allowed one run on three hits and a walk while striking out 10 over six innings in a no-decision versus the Royals on Tuesday.
Rengifo went 2-for-5 with a grand slam and four RBI in Tuesday's 11-2 win over the Brewers.
Buehler (7-5) earned the win Tuesday against the Brewers, allowing one run on three hits and two walks while striking out five over six innings.
Treinen (elbow) was transferred to the 60-day injured list Tuesday.
