On the Main Menu, select Team Management. Then select Roster Management, and go to Create Player. Enter the codes as the Last Name of your created player to unlock them.

Code - Player

WHSUCPOI-Aleksander Pavlovic
POCKDLEK-Andreas Glyniadakis
SDFGURKL-Carlos Delfino
NBVKSMCN-James Lang
SOSODEF-Jermaine Dupri
OEISNDLA-Kyle Korver
POSNEGHX-Mario Austin
SKENXIDO-Malick Badiane
BBVDKCVM-Matt Bonner
ZXDSDRKE-Nedzad Sinanovic
QWPOASZX-Paccelis Morlende
ITNVCJSD-Remon Van De Hare
POILKJMN-Rick Rickert
ZXCCVDRI-Sani Becirovic
IOUBFDCJ-Sofoklis Schortsanitists
POIOIJIS-Szymon Szewczyk
XCFWQASE-Tommy Smith
WMZKCOI-Xue Yuyang