Reiner, a 6-foot-11, 255-pound senior, injured his foot last month, but X-rays were negative. The fracture was revealed after X-rays were taken after practice on Thursday.
"It's a very unfortunate injury for Jared," Iowa coach Steve Alford said."You never like to see injuries, and it's especially tough when it happens to a senior. We'll support Jared as much as we possibly can during his recovery process."
"I give Jared a lot of credit. He has played through a significant amount of pain every day over the past few weeks," added Alford. "He began to feel the discomfort in mid to late-December, yet he missed no games or practice time while playing with the injury."
Reiner started in 12 of Iowa's first 13 games this season, averaging 10.5 points and 7.2 rebounds, and has 11 blocked shots. He led the Big Ten in rebounding last season.