How Young feels Wednesday -- or, specifically, how his right forearm feels -- will indicate when the Padres right-hander will be activated.
Young reported no soreness in his forearm after the simulated game that occurred hours before the Padres faced the Diamondbacks at PETCO Park. Young faced several Padres, hitting coach Wally Joyner and bullpen coach Darrel Akerfelds.
"I thought the fastball looked good as far as command," manager Bud Black said. "He had no ill-effects as far as the forearm. He's getting really close. We have got to make sure he feels good tomorrow."
If that happens, all signs point to Young coming off the disabled list to make a start Sunday against the Colorado Rockies at PETCO Park.
The Padres have yet to officially name a starter for that game.
"I was pleased with the way I threw the ball. Most importantly, I didn't feel any pain or tightness, so hopefully I'll feel good tomorrow. But so far, so good," Young said.
"We'll evaluate tomorrow. Today is just a step, and then tomorrow is an evaluation day. Talked to Buddy a little bit on the field ... he said we'd take a look at it tomorrow, sit down, see what's best and go from there."
Young suffered a strained forearm in a start against Colorado on Aug. 10, which was just his third effort back from missing 59 games after being hit in the face with a line drive in a game in May.
Young is 4-4 with a 4.74 ERA in 13 starts this season.
Corey Brock is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.