I had 51 names to start and hacked than down to 40.

Oakland Athletics 40 players

Raul Alcantara RHP C+
Chris Bostick INF
Yordy Cabrera SS
Adrian Cardenas 2B
Andrew Carignan RHP
Chris Carter 1B
Michael Choice OF
A.J. Cole RHP B+
Ryan Cook RHP C+
Collin Cowgill OF C+
Bobby Crocker OF
Vicmal De La Cruz OF
Josh Donaldson C
Pedro Figueroa LHP
Sonny Gray RHP
Grant Green OF
A.J. Griffin RHP
Blake Hassebrock RHP
Miles Head 1B C+
Ian Krol LHP
Chad Lewis 3B
Tom Milone LHP B-
Jermaine Mitchell OF
Derek Norris C B
Renato Nunez 3B
Ryan Ortiz C
Chih Fang Pan 2B
Jarrod Parker RHP A-
Steve Parker 3B
Brad Peacock RHP B
Tanner Peters RHP
Nick Rickles C
Aaron Shipman OF
Max Stassi C
Daniel Straily RHP
Beau Taylor C
Michael Taylor OF
Blake Treinen RHP
B.A. Vollmuth 3B
T.J. Walz RHP