David Price's tough season took another negative turn.

Price left early on with a strained left triceps in the Tampa Bay Rays' 9-2 loss to the Boston Red Sox on Wednesday night.

Tampa Bay manager Joe Maddon said the reigning American League Cy Young Award winner will probably miss his next scheduled start on Monday. Price, who had an MRI exam, will have his status evaluated on Thursday.

"From what I was told right now, there was nothing really hot on the MRI," Maddon said. "We'll look at it further tomorrow and made a determination at that point. But from what I'm hearing right now it doesn't sound to be awful."

Price (1-4) departed from the marquee pitching matchup with Jon Lester during Boston's eight-run third inning, which Stephen Drew finished with his towering grand slam off Jamey Wright.

Price said he felt discomfort on four or five fastballs during the third.

"It just felt [like] tightness," Price said. "It wasn't like excruciating pain, but I've never felt anything like that before. My gut feeling, I feel OK right now. I don't think it's too bad."

Price left with one out in the third after giving up an RBI single to David Ortiz. The left-hander walked toward the plate after delivering the pitch to the Boston designated hitter and appeared to grimace.

"It's something I've got to take care of," Price said. "I can't just go out there because I'm just not putting my neck on the line. I'm part of this team. I want to be there in August and September and October, when we're playing in the playoffs."

Maddon, a team trainer and the entire Rays infield joined Price on the mound. Price walked off the field after a brief consultation and was replaced by Wright.

"Just looking at him, I knew he did not want to throw [a warm-up pitch]," Maddon said. "I knew something was bothering him, so it was an easy decision."

A 20-game winner last year, Price has struggled this season. Tampa Bay has lost seven of his nine starts, and Price uncharacteristically has given up eight leads over his past seven outings. His earned-run average rose to 5.24 on Wednesday.

The Rays' ace has been bothered by allergies since before the start of spring training, but Price said this week he'd never use that as an excuse for his performance.