Then weighing in on Spurs' and Liverpool's season.
After a goalless draw in Seville, Mourinho led his charges into the second leg with a precarious result considering his side didn't bag an important away goal.
The Belgium global spoke to BT Sport after the final whistle and began by describing the scenes in the home dressing room, where the players were understandably gutted. There was the classic grimace and wipe-the-face-wth-the-jersey moment from Romelu Lukaku.
"I sat in this chair twice in the Champions League", Mourinho told reporters after the match. So this is nothing new for this football club.
"But at the end, in football anything can happen and we proved it, so that's great".
Will Harry Kane's injury cost Tottenham their Top 4 spot?
And the Mirror are among several media sources reporting that Tottenham fear Kane will be ruled out until May at the earliest. The 24-year-old tried to play on, but was forced to come off and left the ground on crutches.
Reminding United of previous anguish is exactly what Mourinho should have been steering well clear of. We have no time for dramas.
He said: "When a team win, everyone wins, but when a team loses, the coach loses". Finishing sixth in the league was a disappointment - although it was down, in part, to the focus on the Europa League - but they look likely to finish second this season, their highest finish since Sir Alex Ferguson retired five years ago. It's hard for us but we have to bounce back. But striker Wissam Ben Yedder, who came off the bench, turned the table by scoring late two goals to send the Spanish club into the last eight of the competition.
They think his response was "embarrassing" and "idiotic".. "We didn't score and Sevilla progressively kept the ball, and they controlled the game well". I expected this from them, this type of approach. "We always get in the right positions and the last pass was not good enough, and that is what killed us today". We are also sad, and we have to win to go back to winning ways, so I hope that the team reaction is going to be good.
And therein lies the kicker.
Ever Banega's corner was flicked on for Ben Yedder to get away a header that De Gea tipped onto the bar, only for it to agonisingly curl over the line.
United should have been back in the game soon afterwards. Ben Yedder was the ideal player with which to exploit that.
But Mourinho's declaration that he does not have regrets betrays a man who will not change. Indeed, Mourinho chose the occasion of one of United's most miserable nights in years to highlight his own past successes. That's not a road he wants to travel down.