Romero, who lost his latest outing on Saturday, led the AL with a 2.05 earned run average in August and had 26 strikeouts in 44 innings. Opponents batted a major league-low .160 against him.
Among his six starts, Romero pitched a three-hit shutout against the Oakland Athletics on August 18, his second shutout of the season and third of his career.
He also earned two wins over the Rays and one each against the Orioles and Angels. He didn't receive a decision against the Royals on August 24 but the Blue Jays won the game and finished 6-0 in his August starts.