Jake Peavy’s left side was wrapped tightly, and the Chicago White Sox’s veteran pitcher sounded late Tuesday night like he was resigned to missing at least one start and probably several more after feeling pain on the left side of his rib cage that he described as “pretty acute” and “pretty sharp.” “I can’t imagine throwing the ball in the next few days with the way I feel now,” Peavy said. But more alarming was the revelation that Peavy admitted that he first felt the discomfort Sunday in Oakland and visited a doctor on Monday, only to last just 2 1/3 innings Tuesday night with a subpar fastball stemming from the effects of the pain. “We didn’t really know, and (the doctor) gave us all different kind of options what it could be,” Peavy said before pointing to the upper left side of his rib cage. “At that point in time I didn’t think it was going to be, I mean I played catch (Monday) and knew it was there and was going to feel it, but I didn’t know it was quite as bad as it was. (Tuesday), obviously with every pitch it got worse.” Peavy said he tried to “gut through it, and it’s just frustrating.” Left-hander Hector Santiago is likely to take Peavy’s strart on Sunday against Oakland at U.S. Cellular Field. Peavy will undergo an MRI Wednesday in Seattle to find out the extent of the injury. X-rays taken at Safeco Field revealed no fracture. But Peavy suffered a broken rib in 2005 after being on the bottom of a celebration while with the San Diego Padres, and he said the pain he felt then was comparable to the discomfort he displayed Tuesday night. “I’m hurting to take a deep breath,” said Peavy, who was sidelined for slightly more than 10 months after suffering a detached latissimus dorsi muscle near his right shoulder on July 6, 2010. “Just walking I can feel it. Something is going on, we’ll find out (Wednesday). If it’s the actual rib, which we’re pretty positive it is, or something around, we’re pretty positive from both of the doctors I saw tonight it’s a rib injury.” Peavy admitted while warming up that he was in much less than top physical condition. “And obviously as the game started, you try to mix and match and try to figure out a way to get big league hitters out,” Peavy said. “I didn’t do a very good job of that, throwing fastballs 84 mph.” Peavy’s last pitch was clocked at 88, well below his average velocity of 91. Peavy, however, was determined to pitch since the Sox were trying to avoid extending their losing streak to eight games against former Cy Young Award winner Felix Hernandez. “This is what you live for as a competitor to go against their best guy,” Peavy said. “I was bumming out even before the start that I wasn’t going to get a good crack at it and go out there feeling normal and go out there. At the same time I felt like was willing myself to go out there and make pitches, I wasn’t able to do that. “When you fight back from arm injuries and significant injuries you feel are part of the game, to have something like this flare up and not even sure how, it’s frustrating and sickening. It brings tears to my eyes.”