Graveman can now resume a season that began with so much promise, as he was 2-0 with a 2.00 ERA in his first three starts before landing on the DL.
"It's better to do it and have it not be a two-month ordeal," Graveman said. "I think we got over the hump quickly, and we're in a good spot now.
"It was the right decision to make, a tough decision, because I felt like I could've gone out and competed still, but that just goes to show, when we have depth as a starting rotation, that we can do things like this."
With Graveman going Thursday, right-hander Jharel Cotton will pitch Friday's opener in Houston. Another starter on the mend, Sonny Gray, is expected back next week in Minnesota. Oakland's ace, set for a rehab start with Triple-A Nashville on Thursday, is recovering from a lat strain.
"It'll be nice getting guys off the DL," A's manager Bob Melvin said, "as opposed to adding guys."
• John Axford (shoulder) is playing catch and "feeling a lot better," according to Melvin. Axford could join the club at some point during this nine-game road swing when he's cleared to throw off the mound.
• Daniel Mengden (foot surgery) will be in Stockton on Wednesday to throw a 40-pitch bullpen session.
Jane Lee has covered the A's for MLB.com since 2010. Follow her on Twitter @JaneMLB.