"It's the best way to forget about this defeat," Cech told Chelsea TV.
"The games are coming thick and fast. We won't have much time to prepare, but we'll get a little bit of rest and hopefully we'll have a good performance on Sunday.
"They are the favourites for the game, but it's the FA Cup and in the FA Cup not every time do the favourites win.
"We're still the holders, so we'll try to keep our trophy as long as we can."