By Tyler Radecki
April 21, 2012

The New York Yankees have shut down starting pitcher Michael Pineda after he felt shoulder pain in his first minor league rehab assignment, according to ESPN New York.

Pineda, who began the season on the disabled list with tendinitis, threw 15 pitches in Tampa on Saturday before he left with pain in the back of his shoulder, according to ESPN New York. Pineda will undergo an MRI on Monday in New York.

The Yankees acquired Pineda in a blockbuster trade in the offseason with Seattle that sent star prospect Jesus Montero to the Mariners, but the team has yet to see the 23-year-old pitcher in the majors. He went 1-4 with a 5.12 ERA in spring training, showing no signs of the 23-year-old who made the All-Star game as a rookie last season.

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