Talking Tuesday with station Detroit Sports 105.1, Hunter suggested that critics back off.
He said "a lot of people don't know what's going on" in Fielder's life.
A four-time All-Star, Fielder was hitting just .245 with one homer and 12 RBIs over his previous 30 games after going 2-for-5 on Tuesday night against the Chicago White Sox.
Asked before the game about his comments, Hunter said they talked and that Fielder will "be fine." He also called him a "brother" and added "we've all got family issues, trust me."
Fielder talked briefly and brushed off reporters, declining to go into any details.
Information from The Associated Press was used in this report.