D'Arnaud was placed on the disabled list with a partial tear of his right UCL on Wednesday, Tim Britton of The Athletic New York reports.
Tommy John surgery is a possibility for d'Arnaud, and if that happens, he could miss an extended period of time. It's hard luck for the oft-injured catcher, who appeared in a career-high 112 games last season. Tomas Nido was called up to fill his spot on the roster and will back up Kevin Plawecki, who will move from a timeshare to a full-time starter role.