"It wasn't much more than you and I playing catch in the backyard," Mattingly said, using the word "submaximal" to describe the effort.
There is no timetable on Ryu's return, but Mattingly repeated that the Dodgers don't need a regular fifth starter until early May because of off-days. Ryu will essentially be starting Spring Training from scratch, and it sounds like the club doesn't expect Ryu back before next month.
Meanwhile, Jansen played flat-ground catch from 100 feet and said he anticipates rejoining the club by "mid-May." He said he is two weeks away from testing his repaired left foot in a bullpen session and will need three more weeks before he is game fit.
For now, the closer is focusing on getting his arm strong and making sure he doesn't put too much stress on the fifth metatarsal in his left (landing) foot, where a benign growth was removed the week Spring Training started.
As a precautionary measure, he is wearing a protective boot for normal walking but not while throwing.
"We don't want to break the bone, that's why we're being so cautious," Jansen said.
Ken Gurnick is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.