The Diamondbacks are already involved in "active discussions" about Justin Upton, and now ESPN's Jerry Crasnick reports that the team will also listen to trade offers for Trevor Bauer (Twitter links). The right-hander has fallen out of favor with some in the organization.

Bauer, 21, was the third overall pick in the 2011 draft. He made his MLB debut this season and surrendered 13 runs in 16 1/3 innings across four starts while also battling a groin problem. Bauer pitched to a 2.42 ERA in 130 1/3 innings split between Double-A and Triple-A this year as well. Between Upton and Bauer, GM Kevin Towers may be in possession of this offseason's two biggest trade chips.