The Brewers acquired Romero (abdomen) and Dustin May from the Cardinals on Monday, Ken Rosenthal of The Athletic reports.
Romero has been shelved since mid-July following an emergency appendectomy, but he's expected to be ready to return in mid-August. The southpaw has authored a 3.35 ERA and 43:16 K:BB over 43 innings this season and is an impending free agent.