Oswalt left Saturday's game in the seventh after giving up back-to-back singles to Ian Kinsler and Michael Young due to what was initially identified as a strained right groin. After the game, Cooper told reporters that Oswalt "said that he could go back out for the seventh. He was at 100 [or] 102 [pitches], and we thought we could get more out of him."
"I came back to the dugout, and they asked me how I felt. I told them that was it and they wanted me to go one more, and I couldn't get through it," Oswalt said on Saturday. "I felt it in the sixth a little bit -- kind of a twinge a little bit, [but] they said go back out one more inning."
Asked about the conflicting accounts on Sunday morning, both Cooper and Oswalt indicated it wasn't any big deal.
"I think just the signal was wrong, a misunderstanding, but we're on top of it, so it's not an issue," Cooper said. "Just a misunderstanding. [It] didn't get communicated the right way, so we'll handle it. Actually, it's already been taken care of by those guys, but I need to talk to Roy to make sure we're all on the same page."
Cooper typically lets pitching coach Dewey Robinson communicate with the pitching staff during games, citing Robinson's strong relationship with the pitchers and Cooper's desire to work through his coaches.
"He'll translate to me what's happening, and we'll go from there," Cooper said.
Oswalt hadn't talked to Robinson on Sunday morning and had no plans to talk with him or Cooper about the matter. When asked if he was comfortable with what happened on Saturday night, Oswalt said he was.
"I haven't really even talked to Dewey this morning about it," Oswalt said. "I mean, I don't know -- he came to me in the seventh inning and asked me if I could go out there one more inning, and I thought I was pushing it a little. But I don't know, I haven't talked to anybody yet."
Oswalt also said he doesn't believe his injury is a strained groin.
"I don't know what it is. It's deeper than the one I had before in '03," Oswalt said. "It feels more like a bruise than anything. It doesn't feel muscular. [It] feels more like two bones hit together a little bit. Right now, it hurts a little bit, but we'll see how it feels. [In] two or three days, [I'll] throw a little bit and see how it feels, go from there."
Oswalt doesn't believe it is a thigh problem, either.
"I'm going to say it's more inner hip than anything," Oswalt said.
Jim Molony is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.