Serven went 2-for-4 with a three-run home run in Sunday's 7-6 win over the Astros.
Harris recorded a save Sunday against the Astros, striking out two in a perfect ninth inning.
Perkins (3-9) earned the win Sunday against the Astros, allowing three runs (one earned) while walking five and striking out six over five innings of relief.
Ryan (glute) completed a 35-pitch bullpen session in St. Paul on Saturday, MLB.com reports.
Lee went 1-for-3 with a solo home run in Sunday's 8-1 loss to the Padres.
Ober allowed one run on four hits and three walks while striking out three over five innings in a no-decision versus the Padres on Sunday.
Larnach is out of the lineup for Sunday's game against the Padres.
Jeffers is out of the lineup for Sunday's game against the Padres.
Muncy will start at designated hitter and bat sixth in Sunday's game against the Astros.
Walton went 1-for-4 with a solo home run in Saturday's 4-3 win over the Astros.
