Benfica striker Donaldson: Chelsea fans will help us pull off FA Cup shock
Asked if Sunday's performance had given the team confidence ahead of their trip to Stamford Bridge, he said: "Definitely, especially given their run of form at home recently hasn't been the best. The pressure will be on them again.
"Obviously the fans are [showing] unrest with the manager. They don't really like the manager so any little thing that goes wrong, they are always on their backs. I think that has played a part in their recent results so hopefully we can put that into our advantage."