Chargois was called up by the Twins on Wednesday, Rhett Bollinger of MLB.com reports.
Trevor May (back) was placed on the DL on Wednesday, so the Twins needed to add a fresh arm to the bullpen. Chargois has put together a strong campaign at Triple-A Rochester, notching a 1.29 ERA with 41 strikeouts against just eight walks in 35.0 innings. However, his lone appearance in the majors this season was a disastrous one where he allowed five earned runs in just two-thirds of an inning. He'll likely work as a middle reliever during his time with the Twins.