The Twins designated Topa for assignment Tuesday, Dan Hayes of The Athletic reports.
The transaction clears a spot on the 40-man roster for the addition of Orlando Arcia. Topa is one of eight Twins relievers to notch a save this season, but he's been highly ineffective overall and particularly of late, yielding 12 runs across 5.1 innings in May. Given his $1.225 million salary, Topa is likely to pass through waivers unclaimed.