Report: Diamondbacks, Cubs discussed Justin Upton for Starlin Castro trade

Cubs shortstop Starlin Castro has made two All-Star teams despite being just 22 years old. (Andy Lyons/Getty Images)

Still in search of a trade partner for outfielder Justin Upton, the Arizona Diamondbacks asked the Chicago Cubs for 22-year-old shortstop Starlin Castro in exchange for Upton, ESPN Chicago's Bruce Levine reports.

The Cubs balked at the offer and cut off talks, according to Levine.

Arizona has openly discussed Upton's availability during the offseason, and he has be on been rumored to be on the trading block throughout the past year. But general manager Kevin Towers' asking price has been too high for teams' liking, as he has reportedly sought top prospects Jurickson Profar and Mike Olt from the Rangers, and/or 24-year-old shortstop Elvis Andrus.

The Diamondbacks' interest in Castro would seem to indicate that they are still interested in acquiring a middle infielder, despite the presence of second baseman Aaron Hill and their deal for young Reds shortstop Didi Gregorius in December.

Upton used his limited no-trade clause to reject an agreed-upon deal to the Mariners for four prospects earlier this month. He has three years and $38 million left on his contract.