Prater has been struggling with an undisclosed illness as his side prepare for their Super Bowl clash with the Seattle Seahawks at MetLife Stadium on February 2.
"A combination of both, like most sick players. We sent him to the doc. They deal with it, give him medication. He'll be fine," Fox told reporters.
Prater made 25 of his 26 field goal attempts this season and also kicked the longest field goal in NFL history from 64 yards.