O'Brien said he is prepared to serve as the team's emergency No. 3 catcher, Sarah McLellan of the Arizona Republic reports.

EDGE Analysis

Backup catcher Chris Herrmann broke two bones in his left hand Friday and will miss the rest of the season. That leaves the Diamondbacks with Welington Castillo and Tuffy Gosewisch as healthy catchers on the roster. O'Brien came up through the minors as a catcher, but the organization has shifted him to the outfield and he hasn't appeared behind the plate this year. It seems unlikely that O'Brien will catch for the team before the season ends.