Brighton boss Roberto de Zerbi rates today's clash with Sheffield United as a "final".
De Zerbi has sought to rally home fans ahead of the game.
We only have to be focussed on today because it's one of the most important games of the season," he said.
I think it's like a final for us because it will be a very tough game, even tougher than Ajax on Thursday.
Sheffield United are a good team, they won their first game last week. To win the game we have to play very well, a great game, with high quality, with the right attitude and we need our fans.
I never ask anything of our fans, but today we need their support, the players need their support. If we win on Sunday I think we can reach another level in terms of mentality.
But we have prepared [to be] at our best, like it's a final."