Former UFC welterweight champion Matt Hughes was hospitalised on Friday after reportedly colliding with a moving train while driving his truck.
HSHS St. John's Hospital in Springfield, Illinois confirmed Hughes, 43, was airlifted to the facility at noon (local time).
"The HSHS St. John's Regional Trauma Team stabilised him and continues to help him in his recovery," the hospital added in a statement.
"Hughes' family asks that you respect their privacy during this difficult time. They ask that you keep Matt in your thoughts and prayers."
The Guardian quoted Illinois state police as saying Hughes was "seriously injured".
He was said to have driven onto railroad tracks at a crossing on Beelers Trail in Montgomery County, with a train hitting Hughes' vehicle on the passenger side.
Hughes was inducted into the UFC Hall of Fame in 2010, a year before he wrapped up his career with a 45-9 record.
He began working for UFC in 2013 and also has been involved with several television shows, including Ultimate Fighter and Trophy Hunters TV.