2. Activate Wade Miley from IL, option Colin Rea to Triple-A
The Brewers starting rotation has been ravaged by injuries this season, forcing the Brewers to rely on a lot of their depth very early on in the season. Colin Rea was one of those arms the Brewers weren't expecting to use, but have needed to use, a lot.
Wade Miley's return will be much needed, as he'll give the Crew the left-handed starter they currently lack and because prior to his injury, Miley had a 3.67 ERA. Miley had a stellar 2.31 ERA prior to his blowup start against the Dodgers, which directly preceded the start where he left with an injury in the 2nd inning.
Colin Rea has actually been quite solid this season. He has a relatively middle of the road 4.47 ERA in his 11 outings this year, but he has kept the Brewers in every game he's started. He's given them a solid chance to win every time out there. That's going to make it quite difficult for the Brewers to option him down to Triple-A, but they're going to be faced with that decision when Wade Miley is activated off the IL soon.
While Adrian Houser has struggled more in the rotation this year, Houser is out of minor league options. The Brewers likely aren't at the point where they want to DFA Houser, knowing that some other team will definitely scoop him up. Rea, however, does have a minor league option remaining.
With the way newcomer Julio Teheran has pitched, the Brewers aren't going to be moving him out of the rotation. When Wade Miley returns, someone has to move out of the rotation.
One possible path the Brewers could take is to activate Miley and send down one of the middle relievers, opting to move either Rea or Houser to the bullpen as a long reliever. But as the pitching staff returns some of the original players, Rea is likely to see himself optioned down to Nashville at some point soon.