David Beckham said United's 2-0 victory over the Dutch team "brought a little happiness at a hard time".
The victory comes after a terror attack at Ariana Grande's concert at the Manchester Arena on Monday which claimed 22 lives and injured many more. This happened in Manchester but everywhere we have to be a united world to fight for peace and to have no more attacks. It obviously takes happiness from our achievement.
In the most painful of weeks for their city, Manchester United provided a fitting tribute on Wednesday by winning the Europa League with one of their most clinical performances of the season. We are just football players but we have an audience so we want to work together for a normal world. The boys were fantastic. They are only the fifth side to win the three main European club trophies along with the UEFA Super Cup.
"These things are bad all over the world, in London and in Paris". We had to focus, it was very important.
"Yesterday morning we were devastated. We performed like a big team today and I think our fans can be very proud of us". They will learn a lot from it and become stronger.
Afterwards the victorious team and Mourinho posed by a large banner that read "Manchester - A City United". The club now has every title in world football.
"But three trophies in the season, Champions League, Europa League".
"We left the best until last, it was all or nothing, if we'd lost and not got into the Champions League the fans and directors wouldn't have been happy".
Mourinho's tally is two Champions League and two Europa Leagues, having also won the latter when it was the Uefa Cup. Despite a successful career, he has never played in a European final before. I try to make my players respect the opponents' strengths and also to understand their weaknesses.
"It's one of the trophies I haven't won in my career and it would be awesome to win it with United", former Chelsea favourite Mata said.