"It is a setback, I guess, but it's only going to cost me one or two days," Burnett said Saturday morning. "It's nothing serious."
A few days prior to his Friday session, Burnett took a synvisc shot -- an injectable lubricant that's used to treat arthritis and is commonly used for the knee. Burnett gets one in his elbow monthly, but his first one of the spring seemingly irritated a muscle, and Burnett felt "a little creak" in his left arm 15 to 20 pitches into his fifth bullpen session Friday -- the first one in which he threw breaking pitches.
Burnett wasn't concerned because the pain occurred on the side of the arm that did not undergo Tommy John surgery in 2005 or a cleanup in August. And two or three doctors confirmed that it was merely a reaction to the injection.
"It was on the opposite side of my arm," said Burnett, who was likely to start the season on the disabled list even before the setback. "There's no stress when it's on that side of the arm, really. Just a random thing."
Alden Gonzalez is a reporter for MLB.com. Read his blog, Gonzo and "The Show", and follow him on Twitter @Alden_Gonzalez. This story was not subject to the approval of Major League Baseball or its clubs.