Injury Notes: Carpenter, Anderson, Pagan, Chen, Cervelli

As always, the rehabilitation status of injured players can have a major impact on teams' plans as the trade deadline nears. Here are a few updates on some players whose recovery could play a role in the trade market's development:

• Cardinals starter Chris Carpenter threw over 100 pitches in a bullpen session Friday and could face live hitters shortly, Jenifer Langosch of MLB.com reports. Though Cards' GM John Mozeliak said recently that Carpenter's status is unlikely to factor into the team's plans, a continued positive trajectory could potentially change that stance.
• The Athletics received good news on starter Brett Anderson today, with MLB.com's Jane Lee reporting (via Twitter) that he will be shedding his walking boot and beginning to work back from an ankle fracture. She also tweets that manager Bob Melvin is bullish on Anderson returning strong, with Lee suggesting that we could see a repeat of Anderson's mid-August return from last season. While the A's rotation has not exactly been a problem area, some have suggested that Oakland could shop for another arm.
• It appears that the Giants are prepared to go the rest of the way without center fielder Angel Pagan, with the club putting him on the 60-day DL. The San Francisco Chronicle's John Shea also relayed comments (on Twitter) by GM Brian Sabean indicating that the club does not expect him back in 2013. As previously noted, this could make the Giants potential buyers for a Pagan replacement. 
• On the other hand, in spite of that need (and this evening's earlier report that the club is actively pursuing Ricky Nolasco), San Francisco could instead stand pat. Shea tweets that, according to Sabean, the Giants will not make any acquisitions unless the team turns around its play before the deadline.
• Though the Orioles recently added a starter in the first significant trade of the pre-deadline market, they could still be considering the addition of more starting pitching. One major factor in Baltimore's internal analysis will surely be the return of Wei-Yin Chen, who has missed much of the year with a strained oblique. Chen looked strong in his rehab outing last night and, according to Eduardo Encina of the Baltimore Sun, could take a spot in the rotation as soon as Tuesday. If Chen can pick up where he left off — his ERA stands at 3.04 through his first 47 1/3 innings of the year — it may obviate the need for the O's to revisit the market. 
• Another day, another bit of bad injury news for the Yankees. As Andy McCullough of the Star-Ledger reports, the catching-strapped club learned yesterday that its primary backstop to start the year, Francisco Cervelli, will have his rehab halted and be shut down for two weeks. With an early August return now the best case scenario for Cervelli and rookie Austin Romine struggling, the Yankees could find it necessary to look for another capable backstop before the trade deadline.