In addition to acquiring right-hander Jon Rauch from the Diamondbacks on Friday, the Twins have also signed left-hander Ron Mahay, a Major League source confirmed.

Mahay was released by the Royals this week after they had designated him for assignment. He had a 1-1 record with a 4.79 ERA in 41 relief appearances (41 1/3 innings) for Kansas City this season.

The signing of Mahay isn’t expected to be announced until Saturday, when both he and Rauch are expected to join the club in Minnesota.

The Twins will be Mahay’s eighth Major League club. In his 13-year career, the left-hander is 25-11 with a 3.89 ERA.

The additions of Rauch and Mahay give the Twins two veteran arms in a bullpen that recently has featured a merry-go-round of young pitchers from Triple-A Rochester. Besides Joe Nathan, Matt Guerrier and Jose Mijares, the Twins have had trouble finding relievers they can turn to in the late innings.