On July 30, 2006, the Yankees traded Montasterios, Matt Smith, and C. J. Henry for Bobby Abreu and Cory Lidle.

Monasterios was selected by the New York Mets in the Rule 5 draft after the 2009 season and promptly traded to the Los Angeles Dodgers, who added him to their 25-man roster.

He was placed on the disabled list after that start with elbow inflammation and on July 15, he underwent Tommy John surgery, shutting him down for the season.

He encountered further arm problems when he reported for spring training in 2012 and had a surgery in March to relocate the ulnar nerve.

[3] After missing most of 2011 and all of 2012 due to injuries, he returned in 2013 to play for the El Paso Diablos of the American Association of Independent Professional Baseball.