"Beating United was the perfect day for us and it shows we have quality in our squad. We played really good football in beating a really good team. They are the champions," said Lucas.
"We still have to improve a lot but this victory can give us confidence to go on to Arsenal and Wednesday and win through in the Carling Cup.
"We want to be in the final of all the competitions. We don't know what Rafa will do with his team selection, maybe he will make changes as we have a lot of important games at the moment.
"But we want to progress as much as we can in the Carling Cup. We know it will be a difficult game as Arsenal are playing some really good football at the moment. They can pass the ball really well, they are creating a lot of chances and scoring a lot of goals.
"We want to get through, so we have to produce another good performance like we did against United. With the confidence that we have now, we can show more quality than maybe we were doing when we were losing games."