"I heard the pop, felt it and it's not good," said Jenks, after the White Sox dropped an 8-6 decision to the Twins. "It's unfortunate with the timing with everything, the way our team has been going. All together, it's one [bad] deal."
The South Siders' closer explained how he had a slight strain of the same area in Seattle last week. But the extra effort given on Tuesday pushed the injury too far.
"During stretch and warmups, I went a little overboard and did a little too much," Jenks said. "I guess I wasn't happy with the slight strain. I had to do it all the way."
Jenks, 28, finishes the season with a 3-4 record, 3.71 ERA and 29 saves in 52 appearances. He fanned 49 in 53 1/3 innings. His season also was hampered by painful kidney stones, which affected Jenks' pitching mechanics when he struggled in late July.
A Sept. 17 appearance at Seattle marked Jenks' last outing, when the burly right-hander allowed ninth-inning home runs to Jose Lopez and Bill Hall, blowing a 3-1 lead for John Danks. The White Sox lost that game in 14 innings, although Jenks said the injury did not affect how he pitched on that particular day.
"It was like having a slight cramp. You are still functional," said Jenks of his Seattle outing. "Just a little irritating."
Despite falling one save short of his fourth straight year with 30, Jenks remains one of the game's more consistent closers. The question is where he will be closing next year.
Jenks earned $5.6 million in the first year as an arbitration-eligible hurler, and has been the topic of trade rumors dating back to the last offseason. When asked about his future, Jenks took a pragmatic approach following Tuesday's piece of bad news.
"There's always going to be another team out there looking for pitching," Jenks said. "[Leaving the White Sox] would be very unfortunate because I love it here and I would like to stay, but it's part of the game. It's one of those things that I don't even give a second thought to because it's out of my control."
Scott Merkin is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.