There have been a number of questions regarding playoff roster rules. David Murphy has some answers on his blog, High Cheese. [Link]
“As of Aug. 31, the Phillies had five players on the disabled list: Mike Zagurski, Scott Mathieson, Francisco Rosario, Tom Gordon and Geoff Jenkins,” writes Murphy. “Which means that, should they choose, they could add any of their minor leaguers who weren't on the roster Aug. 31 to replace one of those five players.” Murphy sees a roster that would include 11 pitchers and six reservists, with no, great fit for J.A. Happ, but a possible opening for speedy outfielder Greg Golson.