Interim Manchester United manager Darren Fletcher speaking to TNT Sports: “Mixed performance. We started OK and then the goal knocked the stuffing out of us.
"I challenged them at half-time to move the ball with tempo instead of just composure. When we got back to 2-1 I thought here we go, the crowd was up, the energy was up but we couldn't get it over the line and get an equalising goal.
"I think you could see the players are fragile but they've got to respond. Confidence is one of the most powerful things in football so when you don't have it, you have to dig deep and then the confidence comes back.
"It's over to them. They need to make sure that they have got it as there is a lot to play for this season. This team is still good enough to achieve success this season but they have to dig deep."
On whether this is his last game in charge: “This is what I have been asked to do. I’ve not had any discussions beyond that. All discussions I’m sure will unfold over the next few days.”
On fan frustration: “Out of cups, only Premier League games to play for, the fans weren’t happy at the end but they have got every right to air their grievances. It wasn’t toxic but they showed their disappointment.
"I'm sure if the players show the right reaction, the fans will get behind them like they always do because there is still a lot to play for in the Premier League this season."
Manchester United defender Diogo Dalot also spoke to TNT Sports: “We created enough to win the game to be honest. Then the red card gave us a disadvantage because we were on top of Brighton in the last moments. Overall, very disappointed because we wanted to go through.
"All the lads kept trying to find spaces, like I said really disappointed because I think we deserved to win."
Did you know?
- Manchester United have been eliminated from both the FA Cup and League Cup in their opening tie in the same season for the first time since the 1981-82 campaign, losing to Brighton and on penalties to Grimsby Town in August.
- United have been eliminated from the third round of the FA Cup for only the third time since the 1984-85 season, also losing at Old Trafford to Leeds United in 2009-10 and Swansea City in 2013-14.