The White Sox on Monday traded closer Addison Reed to the Arizona Diamondbacks for third baseman Matt Davidson, a power-hitting prospect who will join a trio of other newly acquired players in what general manager Rick Hahn called a ‘‘new core’’ for the team.

Davidson, 22, is considered a major-league-ready third baseman with middle-of-the-order power and still-developing defensive skills. He was a late-season call-up for the Diamondbacks and might be the Sox’ Opening Day third baseman next spring.

‘‘There is still refining to take place, and we’ll decide on when he’ll be ready,’’ Hahn said. ‘‘But we feel when he gets here, it will be for the long term.’’

The Sox agreed to part with Reed, 24, whose 40 saves last
season ranked fourth in franchise history, ‘‘because it was important to us to address one of our pressing needs, and clearly third base was one of them,’’ Hahn said.

Hahn said determining who will fill the closer role will be decided in the spring.

‘‘I don’t feel urgency to anoint anyone the closer now,’’ Hahn said. ‘‘We have a pretty decent track
record in finding someone [to close games] when the need arises.’’

Davidson is the fourth young power-hitting position player the Sox have acquired since July. The others are outfielder Avisail Garcia, who came from the Detroit Tigers in the three-team deal that sent right-hander Jake Peavy to the Boston Red Sox; first baseman Jose Abreu, whom they signed from Cuba; and outfielder Adam Eaton, whom they acquired from the Diamondbacks last week in the three-team deal that sent left-hander Hector Santiago to the Los Angeles Angels.

Hahn said another deal might be completed soon as the Sox continue to retool after a 99-loss season.

‘‘We set out to cure some of what ails us and do it on a quicker time frame by adding pieces that are near or at major-league-ready, and we feel we’ve made good progress on that,’’ he said. ‘‘We’re excited and optimistic about the future, but we realize it’s a process. There will be growing pains.’’