The Phils are going to have to clear a couple more roster spots at some point. As of now, they have only five infielders on the roster (the four presumed starters plus Jes Valentin, who is almost certainly headed for AAA), and seven outfielders - but four of those outfielders could open at AAA (Cozens, Goeddel, Quinn, Williams).
They need a backup shortstop/middle infielder. They need a fourth outfielder (and maybe a fifth), and a swing guy (corner OF/IF type). At least.
To make room, failing long-term injuries in the spring (60-day DL assignments before Opening Day), they'll need to trim the roster by about three spots. I see Luis Garcia, Sev Gonzalez, Phil Klein (at least) as on the bubble. If he clears waivers, Luis Garcia will be eligible for minor league FA, and could opt for that.
Possible internal candidates: for the backup shortstop, I don't see one. Featherston, I guess, is a possibility.
For the outfield, Roman Quinn is a possibility (and on the roster), if they think he's ready to share time with Altherr. Cam Perkins? Andrew Pullin (bat's left-handed, which could help)?
For the swing guy, Brock Stassi probably has a shot, if he has a good spring. He bats lefty, which increases his appeal.
I would think they're in the market, quietly, for a left-handed outfield bat.