An Idaho State Police dispatcher says the 28-year-old Keo was taken into custody just after 2 a.m. Saturday and booked into the Ada County Jail.
He wasn't on the jail roster later in the morning, indicating he had posted bail. Jail officials didn't have additional information.
The Broncos said in a statement: "We are aware of the matter involving Shiloh Keo and are in the process of reviewing it."
Keo recovered the New England Patriots' onside kick in the waning minutes of the AFC championship game to help the Broncos advance to the Super Bowl. Denver went on to defeat the Carolina Panthers in the Super Bowl.
Keo has a home in southwest Idaho.