I have...
OFFENSE (25)
QB Brady, Walter, Hoyer
RB Taylor, Maroney, Faulk, Morris
WR Moss, Welker, Galloway, Edelman, Lewis, Aiken
TE Baker, Thomas, Watson
OL Light, Kaczur, O'Callaghan, Wendell, Mankins, Koppen, Neal, Orhnberger, Vollmer
DEFENSE (24)
DL Seymour, Wilfork, Warren, Green, Brace, Wright, Pryor
DE/OLB Burgess, Banta-Cain
OLB Thomas, Woods, Crable
ILB Mayo, Guyton, Lenon
CB Bodden, Wilhite, Springs, Butler, Wheatley
S Meriweather, Sanders, McGowan, Chung
SPECIALISTS (3)
K Gostkowski
P Hanson
LS Ingram
Most likely changes: swap out BJGE for Morris, Britt for O'Callaghan, Connolly for Wendell, Nunn for Lewis, Alexander for Lenon.
Assuming no changes, that leaves one spot for: Ninkovich, Nunn, Alexander, Ventrone or BJGE. (I'm assuming poor Slater's headed to IR.) Nunn has impressed the heck out of me and is a KR option to replace Slater, Ventrone is great on ST coverage, but given the composition of the roster I'm taking Ninkovich.