McKinstry was recalled from Triple-A Oklahoma City on Sunday.
EDGE Analysis
The 27-year-old will take the roster spot of Mookie Betts, who was placed on the 10-day injured list with a cracked rib in a corresponding move. McKinstry has appeared in only four major-league games this season and is 1-for-5 with a two-run home run, and he should receive some opportunities in right field while Betts is sidelined. McKinstry has hit well at Oklahoma City this year with a .328/.414/.463 slash line in 46 contests.