KANSAS CITY -- Royals left-handed pitching prospect John Lamb could be headed for Tommy John surgery.

General manager Dayton Moore said that Lamb has an appointment on Wednesday in Los Angeles with Dr. Lewis Yocum to have his ailing left elbow examined and determine if reconstructive surgery is necessary.

"We've just got to get him fixed and move on, that's part of it," Moore said. "There are a lot of good pitchers that had Tommy John and went on to have great careers. We've got to anticipate that, if that's the case, he'll be one of them."

Lamb left a start for Double-A Northwest Arkansas after just a few pitches because of elbow discomfort. He has a 1-2 record and 3.09 ERA in eight games for the Naturals.

A fifth-round pick in the 2008 Draft, Lamb was named the organization's top pitcher last season, winning the Paul Splittorff Award after jumping three levels. He had a combined record of 10-7 with a 2.38 ERA for Class A Burlington, advanced Class A Wilmington and Northwest Arkansas. In 147 2/3 innings, he notched 159 strikeouts.

Last winter, he was rated ninth in MLB.com ranking of left-handed pitching prospects.

"He's just 20 years old and has youth on his side," Moore said.