The Twins will announce a corresponding roster move prior to Friday's game against the Mariners. But Twins manager Ron Gardenhire said it won't involve another pitcher.
"We're going to go to that extra position player on the bench and go to 12 players," Gardenhire said. "So we'll go from there and see how the road trip goes along."
Swarzak was on the DL retroactive to July 25 with a mild right rotator cuff strain. He last pitched on July 24, when he gave up two runs in one inning against the White Sox in Chicago. But he threw his latest bullpen session on Tuesday and reported no problems.
Manship pitched well on Wednesday, throwing three scoreless innings, but has a 7.89 ERA this year in 21 2/3 innings covering two stints with the Twins.
Perdomo posted a 1.50 ERA in six innings with the Twins, but he had trouble locating the ball, with seven walks in six innings.
The Twins didn't announce which position player they'll recall Friday, but first baseman Chris Parmelee remains the most likely to be called up. He entered Wednesday hitting .354/.470/.691 with 15 homers and 41 RBIs in 49 games with the Red Wings.