According to Lance McAlister:

Today the Reds optioned to Louisville RHP Mike Burns (11g, 0-0, 8.78)…Burns was recalled on 6/18, when Brandon Claussen went on the DL, and since then made 2 relief apps (6/18 vs WSox, Thu at NYM)…was his third stint with the Reds this season.
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Tomorrow, the Reds are expected to recall from a rehabilitation assignment and reinstate from the 15-day disabled list RHP Matt Belisle….since 5/30 Belisle has been on the DL, retroactive to 5/28, with a strained lower back…he didn’t allow an earned run in his 6 rehab apps at Dayton, Chattanooga and Louisville (1-0-1, 9.1ip, 7h, 1r, 0er, 0bb, 9k).