The Scotsman has referred to the height of the Potters, who have made set pieces and long throw-ins their signature attacks.
"The jolly green giants are coming to play against us tomorrow," said Ferguson. "Michael [Owen] is not allowed to play unless he brings a ladder. They are the biggest team in Europe.
"You can get yourself all in a fangle about that because they are a handful at set-piece play and with their long throw-ins. But you can't make a terror for yourself. Hopefully we can play our game and get the result we want."