Source: Angels after Royals' Callaspo

NEW YORK -- Though rumors continue to swirl that the Los Angeles Angels are pursuing an impact bat before the July 31 trade deadline, general manager Tony Reagins has quietly set his sights on more easily attainable infield help.

According to a major league source, Reagins has focused his pursuit on Kansas City Royals third baseman Alberto Callaspo, a former Angel farmhand.

Earlier this month, the Angels discussed the possibility of trading for Washington Nationals slugger Adam Dunn, but quickly realized they didn't have the prospects to acquire a hitter of that caliber. The Nationals are looking for young pitching and the Angels didn't want to part with either Joe Saunders or Ervin Santana. Other teams have only marginal interest in any of the Angels' Triple-A and Double-A pitchers.

"[The Angels'] cupboard is almost bare at Double-A and Triple-A," said one major league scout.

Not surprisingly, the Angels' prospect drawing the most interest from other teams is outfielder Mike Trout, but the Angels aren't willing to move him. They're also hesitant to give up a package of prospects that could further deplete their system. Outfielder Peter Bourjos and catcher Hank Conger have also been mentioned in trade talks.

The Angels are believed to have offered pitcher Sean O'Sullivan and another "fringe prospect," in exchange for Callaspo, but the Royals passed on the deal. Callaspo, 27, entered Tuesday batting .276 with eight home runs and 42 RBIs and has played third and second base for the Royals.

The Angels traded Callaspo to Arizona in March 2006 for reliever Jason Bulger.

The Angels recalled O'Sullivan to pitch Tuesday night at Yankee Stadium. They also recalled right-handed pitcher Trevor Bell and optioned outfielder Cory Aldridge to Triple-A Salt Lake.

O'Sullivan made the start in place of injured left-hander Scott Kazmir. He took the win as the Angels beat the Yankees 10-2.

Kazmir was placed on the 15-day disabled list Sunday because of left shoulder fatigue. The move is retroactive to July 11, the day after Kazmir allowed 13 runs and 11 hits against Oakland.

The 26-year-old Kazmir is 7-9 with a 6.92 ERA in 17 starts.

O'Sullivan was 5-5 in 15 starts for Salt Lake. He made four relief appearances for the Angels and had a 1.29 ERA.

Mark Saxon covers the Angels for ESPNLosAngeles.com. Follow him on Twitter. Information from The Associated Press contributed to this report.