Justin Fields exited Bears-Vikings game with hand injury, replaced by undrafted rookie Tyson Bagent

Chicago Bears quarterback Justin Fields left Sunday's game against the Minnesota Vikings with a hand injury.

Reports after the 19-13 Vikings win revealed that Fields dislocated the thumb on his throwing hand. X-rays ruled out a fracture, and he'll have an MRI on Monday to assess any further damage. His prognosis is unclear.

He was sacked on a third-down play in the third quarter and declined an offer from a teammate to help him up by his right hand.

He briefly went to the sideline medical tent before heading to the locker room. The Bears initially listed him as questionable to return with a hand injury before ruling him out moments later.

Backup Tyson Bagent took the field on Chicago's next possession. Bagent, an undrafted rookie out of D-II Shepherd University (W. Va.), had never thrown an NFL pass.

Minnesota led 12-6 at the time of Fields' injury. Vikings safety Joshua Metellus strip-sacked Bagent on his first possession, and linebacker Jordan Hicks returned it 42 yards for a touchdown.

Bagent finished 10-of-14 passing for 83 yards and an interception. He scored on a 1-yard QB sneak for the Bears' lone TD of the day.

After leading Chicago to a 40-20 win in its first victory of the season in Week 5, Fields struggled against the Vikings prior to his injury. He finished the day completing 6 of 10 passes for 58 yards with an interception.