Pittsburgh selected Beer from the Diamondbacks in the minor-league phase of Wednesday's Rule 5 Draft.
Beer was sent outright to Triple-A Reno by Arizona on Tuesday.
The Diamondbacks designated Beer for assignment Wednesday.
Beer was optioned to Triple-A Reno on Sunday.
Beer went 1-for-3 with a two-run home run in Friday's spring game against the Reds.
Beer was optioned to Triple-A Reno on Wednesday.
Beer isn't starting Saturday against the Rockies.
Beer isn't starting Thursday against the Pirates.
Beer is not in the lineup Sunday against Colorado.