Since his callup, Healy has exceeded expectations, finishing his rookie season with 13 home runs and 37 RBIs in just 72 games, batting .305/.337/.524 in that span.
Monday morning, A's manager Bob Melvin deemed Healy, who began the season at the Double-A level, as their projected everyday third baseman going into next season.
"We feel really comfortable with him at third right now," Melvin said, "and going into next year you would have to consider him the incumbent, and he's proved it based on performance."
Healy is the first Oakland player to take home AL rookie honors since Nate Freiman in May 2013.
Jane Lee has covered the A's for MLB.com since 2010. Follow her on Twitter @JaneMLB. This story was not subject to the approval of Major League Baseball or its clubs.