Mourinho oversaw Europa League, EFL Cup and Community Shield glory in his first season, but Manchester City's eye-watering lead means the Premier League is out of reach on the back of Carabao Cup and Champions League exits.
On a night when it was plain to see the best team won, the United boss claimed their performance was not bad.
United suffered a shock exit in the Champions League last 16 with a 2-1 loss to Sevilla after substitute Wissam Ben Yedder struck twice at Old Trafford on Tuesday. I did my best, the players did their best, we tried, we lost, and that's football.
The Spanish side knocked United out of the Champions League to go through to the quarter-finals for the first time in their history.
Not looking for the away goal in the first leg was mistake enough, but sticking to defensive football, armed with the knowledge that one goal against an unsettled backline and barely any of the defensive quality of Mourinho's teams gone by would put them in a corner, was the self-inflicted killer blow.
After a goalless first half in which the Ukrainians held their own, the Gialorrossi upped the tempo in the second half and scored the winning goal on 52 minutes through their top striker Edin Dzeko.
However yesterday he asked for permission to enter Sevilla's dressing room, before congratulating the players on their brilliant performance and wishing them good luck for the rest of the competition. "I don't think it's something new for the club".
Their last remaining hopes of silverware come in the FA Cup, making Saturday evening's quarter-final against Brighton all the more important. In the first half I do not remember a unsafe situation for them, so I think it was a good controlled performance by them without any kind of danger.
He said: I think the intention; the way we started was really good and really positive. Was he happy that United managed only four shots on target over the two legs. What needs to change to bring the team up to the desired Champions League level? "It's painful, but we have to get right back up, dust ourselves off, and look ahead".
"It's a natural process and we're not the only team that invests money, all clubs invest money in players". Not after those two timid displays in the last 16 against Sevilla. "It is incredible to come to a stadium like this and make it to the last eight of the Champions League".
"When you don't score goals, you don't win the game", Young said after admitting United had fallen short of their expected high standards against Sevilla.
"We defended very well and we deserved our victory, we worked on set pieces and maximising our opportunities in the match".