McKinstry was optioned to Triple-A Oklahoma City on Sunday.

EDGE Analysis

McKinstry was called up Saturday, but he'll return to the minors after left-hander Darien Nunez (undisclosed) was reinstated from the injured list Sunday. The 26-year-old has gone 2-for-17 with a homer, five runs, three RBI and four walks across five minor-league games since the start of August.