Ajax, meanwhile, looked to have killed their tie against Lyon following their 4-1 win in last week's home leg when Kasper Dolberg gave them a 27th-minute lead.
With Ajax on the back foot, Lyon midfielder Rachid Ghezzal set up a frantic finish when his downward header from Maciej Rybus' excellent cross made it 3-1 in the 81st.
The Spanish club finally got on the board five minutes before stoppage time when Argentine defender Facundo Roncaglia headed a Theo Bongonda cross into the far corner of the goal. Some of the work has been invisible to your eyes.
Mourinho added: "Even if it was unfair, I don't know, but even if it was unfair I don't think UEFA rules will allow any chance of an appeal".
Indeed, analyse his career and you can appreciate what he is saying.
Liverpool were given 10,236 tickets for last season's Europa League against Sevilla at Basle's 35,000-capacity St Jakob-Park.
"He's another reason to win the Europa League".
Man United are a big club - they always have been - but they're just not a big team at the moment.
Coming into United it was very different. We had a fantastic record of 25 matches (unbeaten). "They are a young team, strong team and they finished their league this weekend".
Massive ransomware attacks target organizations around the world
Prime Minister Theresa May issued a statement on the attack, declaring that no patient data is believed to have been compromised. Bartholomew's Hospital in London . "It's stressful enough for someone going through recovery or treatment for cancer".
Jose Mourinho says he has worked "harder than ever" during his first season at Manchester United.
The reaction to him as he celebrated in front of the Stretford End on Thursday night showed how much the fans have taken to him.
Manchester United will receive almost £40 million in Europa League prize money if they progress to the final in Stockholm on May 24 - a figure which would eclipse their earnings from last season's unsuccessful Champions League campaign. They are important. But we have one that is more important than others.
The England global will miss the first three games of next season's Champions League campaign as a result.
Matteo Darmian and Man United will contest the Europa League final without many top players.
"We won a League Cup". United can not finish lower than sixth but would have been so much higher had they shown a cutting edge during a 25-match unbeaten league run punctuated by draws.
"The players played a great match, we really rushed Ajax".
"We have good things but, if I was on your side and you are always looking for these kind of capital letters, big headlines, I accept if you say that".
Rob is ESPN FC's Manchester United correspondent.
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