"I thank the Lord it wasn't too serious and I wasn't out like I was last season for two months," he said. "Hopefully, I can keep it under control and finish out the season."
Fields was pitching well prior to getting injured. Since being recalled from Triple-A Oklahoma City on May 14, he had posted a 1.17 ERA in 14 outings covering 15 1/3 innings with 22 strikeouts, while allowing just 10 hits and three walks.
"Like I said before I came back up after I was sent down, it's just about relaxing," he said. "That's what I plan on continuing to do throughout the rest of the season."
Coming on in relief in the seventh inning of Friday night's 7-6 loss, Fields allowed an RBI double to Howie Kendrick before striking out the last four batters he faced.
Brian McTaggart is a reporter for MLB.com and writes an MLBlog, Tag's Lines. Follow @brianmctaggart on Twitter. This story was not subject to the approval of Major League Baseball or its clubs.