FRIDAY: Despite Towers' comments, ESPN's Buster Olney tweets that the Diamondbacks are at least discussing Jake Peavy as a possibility, noting that the White Sox have scouted Randall Delgado (Twitter link). Given the number of available relievers the White Sox have, the Diamondbacks could ask for both Peavy and a bullpen arm in a trade, though that's just speculation on my part.
THURSDAY: While many of the rumors regarding the D-Backs' search for pitching thus far have focused on starting pitchers such as Yovani Gallardo and Jeff Samardzija, GM Kevin Towers told MLB.com's Steve Gilbert that bullpen help is the team's bigger need:
"I'm not as concerned probably with our starting pitching and looking externally for starting pitching as much as trying to get a bullpen arm," D-backs general manager Kevin Towers said.
Towers feels that injured starters Trevor Cahill and Brandon McCarthy can help to upgrade the team's rotation when they return from the disabled list. Jack Magruder of FOXSportsArizona.com echoes that sentiment (Twitter link), adding that Towers will not trade top prospects Tyler Skaggs or Archie Bradley. Skaggs had been mentioned as a possible component to a Gallardo trade.
The Diamondbacks have actually received a combined 3.33 ERA from their bullpen this season, but J.J. Putz has been injured and Heath Bell has an 8.38 ERA over his past 11 appearances. They also lost one of their top relief arms when Matt Reynolds hit the disabled list in early June. So far, the Diamondbacks have been linked to the Brewers' bullpen options such as John Axford, Francisco Rodriguez and Michael Gonzalez. Other teams such as the Marlins, White Sox and Twins figure to have bullpen arms that could be moved in the coming weeks as well.