Sevilla were the better team in the first leg against the English giants but they failed to score goals and ended the game with a goalless draw.
"In modern football you have to live day-by-day, week-by week and match-by-match and I can imagine that if we lose against Sevilla on Tuesday everyone will have forgotten what we did in the last couple of weeks".
Consecutive Premier League wins against Crystal Palace, Chelsea and Liverpool have The Red Devils in second place of the standings, but now the team needs to switch the focus to the UEFA Champions League.
"We have to beat Sevilla to go through, so we give our best".
It was seen as a missed opportunity for Sevilla, given they controlled much of the game and saw Luis Muriel denied a goal by a remarkable David de Gea save just before half-time.
Asked whether he felt he had a squad good enough to make it a hat-trick of titles with United, he replied: "Not yet".
Most clubs would be delighted to be sitting second in the Premier League, into the FA Cup quarter-finals and on the verge of a return to the last eight of the Champions League. He came in for a big game and did the business, but I wouldn't be surprised if he's back on the bench.
"Part of Alexis' talent as a player is that he knows what the Champions League is and that is important when you go to the knockout, then the semi-finals".
Lovren was powerless as the Belgian easily shrugged him off after 14 minutes to flick on to Rashford, who had got the wrong side of Trent Alexander-Arnold.
"He was progressively getting chances to play".
He added: "I don't think we are one of the best teams in the competition".
Which of these stars would you like to see at United next season? Now, I have only one name in my mind. Their form since the first leg is not encouraging. They'll sit in and pick Besiktas off at will, with Robert Lewandowski and Thomas Muller sensing the right moments to strike.
The Andalusians also have history to deal with - Sevilla have played six times in England and not won even once.
"In training is where I'm doing most of my learning".
Mourinho was content to allow Liverpool's middle three time, instead encircling the front three so Mohamed Salah, Sadio Mane and Roberto Firmino would have found playing in a telephone box more comfortable.