Jeff Wilson of the Star-Telegram reported on Wednesday that Fielder is slated for fusion surgery.
Fielder appeared in 89 games this season, posting a slash line of .212/.292/.334 with eight home runs and 44 RBI.
Fielder, 32, is a six-time All-Star and one of the most dangerous power hitters in baseball when he's healthy. Unfortunately, he appeared to be fighting through pain all year long, which was also limiting his productivity at the plate.
Although Texas has alternatives to turn to in Fielder's absence, hopes of him returning to his prime form have taken a considerable hit, if not his career outlook. Due to make $24 million in each of the next four seasons, per Spotrac, Fielder has his work cut out to live up to that price tag.
Outfielder Shin-Soo Choo, catcher Bryan Holaday and starting pitchers Derek Holland and Colby Lewis are among the key Rangers who are on the disabled list, via RosterResource.com.
The club's once-commanding lead in the American League West has shrunk in July, putting all the more pressure on others to step up.
Fielder's leadership and gregarious personality will also be missed in the clubhouse with his season being cut short. Jurickson Profar has played multiple games at every infield position for Texas in 2016, though, and has served as DH as well.
Joey Gallo just made his 2016 debut on Tuesday and had a solo homer against the Oakland Athletics, which bodes well for his future as he figures to fill in at first base.