TAMPA, Fla. -- A day after leaving a Minor League intrasquad game holding his left elbow, Phillies reliever Michael Zagurski may be facing Tommy John elbow ligament replacement surgery.

The lefty, who had been recovering from September surgery to repair a torn right hamstring, was examined Monday. According to a team source, the initial diagnosis was a sprained flexor tendon, though additional tests showed ulnar nerve damage.

He'll likely seek a second opinion, as is customary in these matters.

Should Zagurski opt for the procedure, he'll miss the 2008 season and, likely, part of '09.

A 12th-round pick by the Phillies in the 2005 First-Year Player Draft out of the University of Kansas, Zagurski began the 2007 season at Class A Clearwater, and ended it on the Major League disabled list. He posted a 5.91 ERA in 21 1/3 innings over 25 games.