Juenger was optioned to Las Vegas just four days ago, but he'll rejoin the big club after the Athletics placed lefty Jose Suarez (hip) on the 15-day injured list in a corresponding move. The 26-year-old righty has made eight relief appearances for the Athletics this season, striking out five batters over 9.1 innings while giving up six earned runs on 15 hits and three walks.

Juenger will lose his spot in the big-league bullpen after giving up four runs on five hits in just one inning during Friday's blowout loss against the Red Sox. Yunior Tur will come up from Las Vegas to fill the opening.