Farke has more players in the treatment room than the changing room at the moment, with 10 first-teamers - including goalkeepers Tim Krul and Ralf Fahrmann - ruled out of the Villa match.
"If I am honest it is really difficult to repeat miracles on a weekly basis. We had too many problems for this game to be really there and gain some points," the German manager said.
"There were also so many players on the pitch who not able to train and had painkillers because we had no other options. Two or three key players didn't have the best game and if this comes together you will not be competitive."