The Twins officially announced the signing of reliever Addison Reed to a two-year, $16.75 million contract.
The signing was first reported Saturday.
Buddy Boshers was designated for assignment to make room on the team's 40-man roster.
Reed is a seven-year veteran who has pitched for the White Sox, Diamondbacks, Mets and Red Sox. In 410 major league games he is 18-21 with a 3.40 ERA and 125 saves, with 425 strikeouts and 103 walks in 402 innings.