PHOENIX -- The D-backs have retired a pair of numbers, in addition to Jackie Robinson¡¯s No. 42.

They retired Luis Gonzalez¡¯s No. 20 in 2010 following his retirement from baseball, and in 2015 they retired No. 51 for Randy Johnson, who had entered the National Baseball Hall of Fame earlier in the year wearing a D-backs cap.

¡°One is the greatest pitcher in our history, and the other is arguably the best offensive player in our history,¡± D-backs team president/CEO Derrick Hall said. ¡°And they¡¯re the most popular players that we¡¯ve ever had wear the uniform.¡±

? D-backs' retired numbers

Hall is right, of course, both Gonzalez and Johnson were no-brainers to have their numbers retired. The question for the D-backs now is who¡¯s next?

The D-backs don¡¯t have a policy yet in place when it comes to retiring numbers, but that could soon change.

¡°Right now is really the perfect time to adopt one,¡± Hall said.

Two players jump to mind right away when it comes to who might be next: Curt Schilling and Paul Goldschmidt.

Here¡¯s a look at each:

Schilling
This one is complicated for a variety of reasons.

Schilling was a co-MVP of the 2001 World Series, and there¡¯s no way the D-backs would have that championship without him.

But his time with the D-backs lasted just 3 1/2 years, from July 2000 until after 2003, and after he left, the D-backs didn¡¯t go out of their way to not issue his No. 38. It was given out a year after he departed to reliever Brandon Lyon. Luke Carlin, Sam Demel, Will Harris and Robbie Ray have also worn No. 38 since Schilling left.

Schilling¡¯s Hall of Fame candidacy has gained steam, and it seems he has a good chance of making it next year. If that happens and he chooses to wear a D-backs cap or a cap with no logo, the D-backs could decide to retire his number.

¡°We would have a decision to make,¡± Hall said. ¡°He¡¯s talked about going in without a team because of his long history with the Phillies and his success here, but who knows?¡±

Goldschmidt
Since he was traded to the Cardinals after the 2018 season, the D-backs have not issued Goldschmidt's No. 44, and a story that Hall tells about what managing general partner Ken Kendrick told a player who wanted to wear that number gives you a pretty good indication where the club stands.

¡°A player had inquired about wearing No. 44,¡± Hall said. ¡°And Ken told him, ¡®I probably wouldn¡¯t if I were you. Those are pretty big shoes to fill, and it¡¯s probably a number we¡¯re going to really consider retiring one day because he means so much to us.¡¯¡±

Goldschmidt spent eight seasons with the D-backs, hitting .297/.398/.532, and he and Gonzalez rank 1-2 in franchise history in every major statistical category.

Then there¡¯s the fact that Goldschmidt was a huge part of the Arizona community, something the D-backs take great pride in.

¡°[He¡¯s] a recent player who had tremendous impact on the franchise and is a real point of pride for us as someone we drafted and developed,¡± Hall said. ¡°And we absolutely love the guy.¡±

In the meantime, the D-backs will work on their policy for retiring numbers, walking the fine line between making sure the player is elite, but not necessarily requiring induction into the Hall of Fame.

¡°Obviously, we hope there¡¯s going to be more Diamondbacks in the future in the Hall of Fame,¡± Hall said. ¡°But let¡¯s say there never are. You still want the ability to retire a uniform number of someone who has had a tremendous impact on your franchise and your community.¡±