Cole left City last summer and is now playing for Bradford City.
He told the Daily Mail: "The foreign players were always pushed first and if you'd seen us all train, you wouldn't see a difference in ability.
"It is very cliquey at City. The manager has that connection with some players, Hispanic-like. I still have my friends there and they tell me this, and obviously when I was there I saw it as well. They'd speak Spanish on the training pitch."