The power-hitting Nunez, who on Monday was named to the All-Pacific Coast League team, leads all Minor League players with 32 home runs this season, while driving in a team-high 77 runs.
"He's probably one of the most polished hitters I've seen," A's first baseman Matt Olson said. "Seeing him get consistent at-bats here would be fun to watch."
Those will be hard to come by, however. Nunez has clocked the most time at third base, where Matt Chapman is entrenched; and although he's also been spending time in left field and at first base the last two years, those positions are also preoccupied in Oakland.