San Diego Padres right-hander Yu Darvish is going on the restricted list due to a "personal matter involving his family," manager Mike Shildt said Saturday, according to AJ Cassavell of MLB.com.

Shildt added that there is no timeline for Darvish's potential return.

"We want to respect his privacy," Shildt said, according to 97.3 The Fan. "He wants to make sure that everybody knows that he's physically in a good spot. He's still working on his craft but he is going to step away right now."

Darvish, 37, has posted a 3.20 ERA with 1.06 WHIP and 8.5 K/9 over 56 1/3 innings (11 starts) this season.