Pat Neshek, Jeremy Hellickson, Daniel Nava, Joaquin Benoit, Tommy Joseph, and Howie Kendrick are all expected to be traded if not by July 31st, then August 31st at the conclusion of the waiver trade deadline.
Additionally, role players on the roster including Ty Kelly, Andres Blanco, Holby Millner, Cam Perkins, and Brock Stassi are expendable pieces regarding the 40-man roster. The Phillies could keep all of these players if they were designated for assignment and not claimed on waivers, but they would have to report to the minor leagues.
If the six trade pieces mentioned earlier are in fact moved, there would be as many spots available on the 40-man roster.