The two players the Reds will receive in return will be determined at a later date. The 30-year-old, an All-Star in 2009 and '10, has a 1.86 and 37 strikeouts in 48 1/3 innings this season. He has been with the Reds since 2012 and is set to make $9 million next season. His deal is set to take him through 2015 with a club option for '16.
The move comes on the final day that teams can acquire players for the postseason roster.
The Brewers enter the day with a one-game lead in the NL Central heading into their series finale in San Francisco against the Giants. The Reds are fourth in the NL Central.
- Marc Weinreich