Teamnasty yes you can keep him but he counts against your keeper limit so you would only have 14 healthy players to protect just make sure to list that you are keeping him.
The following players were kept last year that were hurt:
Urias, Julio (Inj) Familia, Jeurys (Inj) Dahl, David (Inj)
Check the google doc they are listed as keepers but I list them in red.
If I keep him as one of my 15, I can still cut him at some point in the year if I want to during add/drops right? I'd just have to announce it on the league thread since he doesn't have a card.
Right just announce you are cutting a player that doesn't have a card. Of course at that point you would lose his rights, but what you are asking can be done.
WJS6768 Keepers: Zack Greinke Gio Gonzalez Archie Bradley Mark Reynolds Yoenis Cespedes David Dahl Mike Montgomery Carlos Gonzalez Derek Dietrich Jesse Winker Amed Rosario Brandon Nimmo David Hernandez Curtis Granderson Carson Kelly
Also keeping my prospects - B. Rodgers, H. Greene, M. Baez
Jose Quintana Trevor Williams Sam Freeman Kyle Barraclough Buster Posey Willson Contreras Manny Pina Justin Turner David Freese Javier Baez Miguel Rojas Gerardo Parra Christian Yelich Phillip Ervin Jason Heyward
Rich Hill Hyun Jin Ryu Nick Pivetta Johnny Cueto Steven Matz Adam Ottavino Cody Bellinger Brandon Belt Daniel Descalso Orlando Arcia Adam Eaton Ian Happ Bryce Harper Marcell Ozuna
Promote - Corbin Burnes
I have a few players that might have some trade value too: Jon Lester Hunter Renfroe Tucker Barnhart Tyler Flowers Wilmer FLores
Jameson Taillon Robbie Ray Tanner Roark Luis Castillo Brandon Morrow Francisco Cervelli Jesus Aguilar Ben Zobrist Dansby Swanson Brian Anderson Maikel Franco Starling Marte A.J. Pollock