D'Arnaud attempted to throw on Saturday in Port St. Lucie, Florida, for the first time since landing on the DL on April 26 with a rotator-cuff strain in his right shoulder. D'Arnaud had to halt the session because of renewed shoulder discomfort.
"He described it as much less than what he originally felt," assistant general manager John Ricco said Saturday. "But, still, his instructions were that if he's feeling anything in there to stop and then he'll wait a little bit longer. I'm not sure yet what time frame they're going to wait. We'll probably find that out tomorrow when we talk to the PT (physical therapist). He'll continue to be able to do what he's been doing, which is some catching drills and hitting. But he won't throw for a little bit."
Manager Terry Collins described the setback as "pretty discouraging for him and us."
D'Arnaud has experienced a litany of injuries throughout his professional career. He was limited to 67 games last season because of a broken right pinkie and strained left elbow.
Kevin Plawecki is handling the primary catching duties in d'Arnaud's absence. He enters Saturday's game against the San Diego Padres hitting .189 with two RBIs in 37 at-bats, although he has a .333 on-base percentage thanks to seven walks and being hit by a pitch.
Backup Rene Rivera is 1-for-9 with a homer, two RBIs and one walk in three games since last week's promotion.