Minnesota Vikings running back Alexander Mattison (illness) has been downgraded to out for Week 13 against the Jaguars. Mattison had appendicitis and underwent successful surgery, according to a source. The 22-year-old could also be forced to miss Week 14 against the Buccaneers. With Mattison sidelined list Sunday, expect Ameer Abdullah to serve as Dalvin Cook's primary backup. The Vikings also have Michael Boone on the active roster. Cook, who is second in the NFL in rushing yards behind the...