JUNE 16: In addition to discussing Samardzija and Hammel trades, the Cubs are at least willing to consider the possibility of moving additional arms, Jon Morosi of FOX Sports reports (Twitter links). Morosi hears Chicago is trying to gauge the market on Samardzija, Hammel, Edwin Jackson and even Jake Arrieta.

It’s not surprising that they’d be willing to move Jackson, as they undoubtedly would be pleased to shed some of his salary obligations — he is owed roughly $28.3MM through 2016 — but Arrieta is somewhat of a surprise. Chicago acquired him in last year’s Scott Feldman trade, and he’s off to an outstanding start in 2014, having pitched to a 2.09 ERA with 9.2 K/9, 2.9 BB/9 and a 52.1 percent ground-ball rate in 43 innings. Still just 28 years old, Arrieta is not yet arbitration eligible and is under team control through 2017, so it stands to reason that the asking price would be high.

Listening on Arrieta is a bit puzzling, as one would think he’s the type of arm the Cubs would like to build their rotation around, but he’s also battled injuries and has never been able to consistently succeed in the Majors, despite having the talent to do so. As Morosi notes, the Cubs aren’t planning to trade all four starters, but rather is doing its due diligence to know the market value of each starter heading into trade season.

JUNE 14: The Cubs are already discussing trades involving starting pitchers Jeff Samardzija and Jason Hammel with at least two teams, Gordon Wittenmyer of the Chicago Sun-Times reports. Interested teams include the Braves, Blue Jays and Mariners, and Wittenmyer cites one source from within baseball who tells him Hammel is likely to wind up with Seattle.

With about six weeks left to go before the trade deadline, the Cubs are 27-38, 11 1/2 games behind the Brewers in the NL Central. It is, of course, not necessarily surprising that the Cubs would consider trading two veteran pitchers who are having good seasons. Samardzija, who is eligible for free agency following the 2015 season, currently has a 2.77 ERA with 8.1 K/9 and 2.6 BB/9 in 91 innings. Hammel, who’s signed to a one-year deal for $6MM, is in the midst of the best season of his career, with a 2.81 ERA with 8.2 K/9 and 1.9 BB/9.

Steve Adams contributed to this post.