Graham said he rolled his vehicle over while attempting to avoid a vehicle in another lane.
The 34-year-old actually refused to be checked by paramedics after the accident, according to Andy Slater of Fox Sports 640.
Graham wasn't at fault for the incident, adds Slater.
The 11-year veteran is coming off his first season with the Bears. He recorded 50 receptions for 456 yards and eight touchdowns in 2020.