We do have something slightly in our favour....rest. City have two cup games before they play us next Wednesday, so we will be their 3rd game in eight days, they'll also have one eye on their next game after ours....Chelsea! if their squad is good enough to withstand that and brush us aside again, fair enough.
I doubt their cup teams will resemble the teams against us or Chelsea. They have a big enough squad - especially against West Ham, with the 6-0 lead they have. They might have a few in their team for Watford, given they want this quadruple.

