Mingo, who was drafted from Louisiana State University in the first round in April, was injured in the first half of Cleveland’s 24-6 victory over Detroit on Thursday.
The initial diagnosis was that Mingo had a rib injury, but following the game he was taken to the hospital for further examination. Coach Rob Chudzinski said Mingo would be kept overnight.
The details on how Mingo was hurt are unclear. The 6-foot-4-inch, 240-pound player jogged to the tunnel with a trainer for treatment after he was injured.
And more bad news hit the Browns when running back Dion Lewis broke his leg and is likely done for the season. Cleveland also lost offensive guard Jason Pinkston, who suffered a severely sprained ankle. He left the stadium in a walking boot and on crutches.