Reyes was recalled from Triple-A Nashville on Friday.
Reyes failed to land a spot on the Brewers' 40-man roster this year, but he slashed .264/.345/.450 with five homers, 29 runs, 17 RBI and seven stolen bases over 33 games in Nashville to begin the year. The 28-year-old will provide depth for the major-league club after Mike Brosseau (ankle) was placed on the 10-day injured list.