"He came out of his bullpen fine," Padres manager Bud Black said. "It looks as if Clayton is tracking toward Monday."
Edinson Volquez, originally scheduled to pitch Monday, has been pushed back until Tuesday. Richard has been on the disabled list since May 5 with an intestinal virus.
"I'm definitely excited to be back with the team and I'm ready to pitch when I get the opportunity to," Richard said. "Everything has been going well and I've been feeling good. That's the reason for everything, to start feeling better, and it feels good to be on the right track."
Richard threw a bullpen on Friday at Chase Field. He's also made two rehab starts at Triple-A Tucson, going 0-1 with a 2.25 ERA with 12 strikeouts and no walks in 12 innings. He also tinkered with his arm slot during the Minor League stint.
"It was good to have a couple of outings and get that feeling back," Richard said. "Eric [Stults] and Jason [Marquis] are really keeping us in it and Volquez is coming back. He's had a couple of tough innings, but on the whole, he has done pretty well. I'm really excited to be a part of it again."
Richard is off to a slow start, going 0-4 with an 8.54 ERA in six starts for the season.
"We're hopeful that it's just a one-time thing," Richard said of the virus.
Jesse Sanchez is a national reporter for MLB.com. Follow him on Twitter @JesseSanchezMLB. This story was not subject to the approval of Major League Baseball or its clubs.