After feeling tightness in the back of his arm for the fourth, or maybe fifth, time during the third inning Wednesday against the Red Sox, David Price looked into the Rays dugout and summoned for help.

Never in the thousands of fastballs he threw had he felt something like this, and he knew as he walked off the mound mid inning with head athletic trainer Ron Porterfield something was wrong with his valuable left arm.

A subsequent MRI exam late Wednesday led to a diagnosis of a strain of the triceps muscle.

Further evaluations and announcements are expected today, though Price seems destined for at least a short stint on the disabled list with Jake Odorizzi, perhaps, the most likely replacement.

"It felt like more than just tightness," Price said.

"It didn't feel the best. It wasn't like excruciating pain, but I've never felt anything like that before."

Manager Joe Maddon was reluctant to speculate on Price's status but said he doesn't believe the injury is serious.

"From what I was told right now, there was nothing really hot on the MRI," Maddon said. "We'll look at it further (today) and make our determination at that point. But from what I'm hearing right now, it doesn't sound too awful. Actually, it was almost like good news."

Price said much the same about the MRI exam: "I guess it was as good as it could have been."

The triceps is a muscle on the back side of the upper arm, obviously integral to pitching. Toronto's Josh Johnson has been sidelined since late April with triceps soreness and isn't expected back until June.

Price, who has struggled through the encore to his AL Cy Young-winning season (now 1-4 with a 5.24 ERA), seemed to be off to a good start Wednesday, hitting 95 mph in the first inning and allowing one two-out hit in each frame.

"I thought he was throwing the ball really well," Maddon said. "I didn't see anything unusual about his throwing motion to indicate there was something wrong with the arm."