Roberts impressed during pre-season but Todd Cantwell's form in the Premier League had kept him out the sidelines.
Farke said: “We totally believe in him or we would not have tried so hard to bring him in.
“He is a brilliant lad who is full of potential. He is the type of player who can change a game because he has this ability that he can create something in a one against one situation.
"With Patrick I feel that is not a problem. He is fully convinced this is the right place. Patrick was signed by a big club in Manchester City and it is not so easy to play for the first team there because of all the big names and competition.
“If they decide to loan him out it is because they trust in him as the future."