Miami Dolphins running back Alexander Mattison underwent season-ending neck surgery Sunday in Chicago, sources told ESPN's Adam Schefter on Monday.
Mattison suffered the injury after he was tackled on a 21-yard pass play in Sunday's preseason game against the Chicago Bears and was taken by ambulance to a local hospital, where the surgery took place, the sources told Schefter.
He is expected to make a full recovery, sources told ESPN's Jeremy Fowler.