Manchester United boss Erik ten Hag says he will “not accept a team that is not giving its best” as the Red Devils are facing Brighton for a place in the FA Cup final at Wembley on Sunday.Twelve-time winners United crashed out of the Europa League quarter-finals on Thursday with a 3-0 defeat by Sevilla.UEL: Sevilla’s killer duo – En Nesyri and Maguire! United are out of the competitionIt was a result that Ten Hag said had left him “really mad”.”We played a quarter-final in Europe, you have to give everything. But we didn’t. It is unacceptable,” he said.”As a manager, I cannot accept a team that is not giving its best. I will never accept it. I made them aware of my feelings. They didn’t manage the standards of how I manage a team in professional football.”Even if you don’t play at the highest level we still have to win. That is what we have to learn. If we have setbacks, we have to stick to the plan, stick to the game. You have to keep the confidence.”##NAJAVA_MECA_7199138##Mahrez cuts off the Blades to book City the FA Cup showdown ticketHis Brighton counterpart Roberto de Zerbi, meanwhile, said appearing in the semi-final was an “honour” and that his side will play with “emotion”.The Seagulls are seeking to reach the final for the first time since 1983 – when they lost to United in a replay.”We are excited. We want to play with our DNA,” the Italian said.FA CUPSemifinalsSaturdayMan City – Sheffield United 3-0 (1-0)/Mahrez 43 pen, 61, 66/Sunday18:30: (2.55) Brighton (3.35) Man.Utd. (2.75)***odds are subject to change***