We bowed out of the Europa League Round of 32 3-1 on aggregate against Fiorentina after a 2-0 loss in the Stadio Artemio Franchi on Thursday night.
But there is no time to dwell on that result with the Capital One Cup Final just around the corner.
The squad remained in Italy to train on Friday and Nacer said the players' collective focus was now fully fixed on Chelsea.
“We’re all disappointed but now we have to prepare for Sunday, a huge game and a big occasion,” said Nacer.
“It means a lot to be at Wembley. We all worked hard to get there and now it’s about winning the cup. It’s one game and we know we can do it.
“We have showed that we can beat Chelsea and we have to try to do it again.”
Nacer couldn’t hide his disappointment after our European exit.
“We had chances in the first half, more possession and played better than Fiorentina but they countered us and scored,” he added. “It was like the first leg, we had the chances and should have scored more.
“They are going on in the competition and we are out, so that’s very frustrating.”