Pascal Gross scored the only goal as Brighton and Hove Albion beat Manchester United on Friday to secure their place in the Premier League next season.
Gross’ winner was awarded by goalline technology and lifted the Seagulls, eight points clear of the relegation places with two games remaining.
“We worked really hard, today you can see the effort from the boys was magnificent,” midfielder Anthony Knockaert told Sky Sports.
“It was a night we’ll remember all our lives, to stay up against Man U is unforgettable. It’s brilliant for us.”
Brighton had the best chances in the first half with Glenn Murray and Jose Izquierdo denied by United keeper David de Gea.
The Seagulls then struck in the 56th minute when Marcos Rojo appeared to clear Gross’ header, only for the goal to be given after it was confirmed the ball had cross the line.
Despite the loss, United remain five points ahead of Liverpool in the race to finish second behind champions Manchester City.
“It was not good enough,” United manager Jose Mourinho said.
“The attitude from the first minute and especially in the first half, they had more appetite.
“I did not succeed in persuading my players that getting four more points we need to finish second is important.”
West Bromwich Albion will be relegated if they fail to beat Tottenham among Saturday’s six matches and could be joined in the drop by Stoke City, who host Crystal Palace.